JPH09289513A - Atm communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To predict VC in the state causing a congestion by permitting a traffic monitoring means arranged at the entrance of an ATM switch node to only monitor on-line information such as a burst size, etc., without executing traffic control such as CLP rewriting and cell annulment, etc., which the means originally has. SOLUTION: The ATM switch node 13 is provided with UPCs 40-42 of the traffic monitoring means, which are provided at every communication lines so as to monitor the traffic quantity of a cell at the entrace of VC, a buffer 23 and a cell hearting/multiplex function part 63 which are formed inside the switch held by the node so as to store the cell and a processor 53 operated as a traffic means which executes the control of the whole node such as connection receiving control, etc., and predicts the occurrence of the congestion by on-line information. UPCs 40-42 only monitors a rate and the burst size being on-line information. The processor 53 predicts the occurrence of the congestion and indicates burst control only as against VC where the adjustment of traffic quantity is required.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an ATM communication system,
Particularly, it relates to cell congestion / discard control in a private or public ATM network in which a plurality of ATM switch nodes are connected.

[0002]

2. Description of the Related Art To control traffic in a conventional ATM network, for example, an ATM-LAN is used.
Network (SRC Co., Ltd., pages 111 to 127)
Page)), first, VC (Virt
that is, PCR (peak cell rate), CDVT (cell delay variation tolerance), SC for each call
Set traffic parameters such as R (average cell rate) and BT (burst tolerance). The terminal basically has to send traffic to the network according to these parameters. For cells that exceed this, UPC (UPC (U
ser Parameter Control function and NPC (Network Parameter Con)
TRL) traffic monitoring means is subject to rate restriction control and is discarded, or CLP (Cel
l Loss Priority) bit flag is added. This is also one of the means for preventing congestion and discard in the network by preventing the traffic volume exceeding the declared level from entering the ATM network.

Also, in an ATM network, traffic can be handled in different quality classes (traffic classes), and priority control (using a buffer for each quality class)
Delay priority). As a quality class, CBR for audio and video, VB for variable rate video
R, ABR mainly for data communication on existing LAN
UBR that does not perform any control other than PCR and PCR is prepared, and the priority order is CBR, VBR, ABR,
The order is UBR.

In this way, basically, traffic control is performed by restricting input to the network and performing priority control for each quality class. Especially for the ABR class,
Congestion control using a feedback function is specified. This congestion control is the ATM in the network.
It is assumed that the switch node has a function of monitoring the traffic state of each line and issuing a management cell (RM cell) for notifying the use status of the line to an ABR class call, The transmitting terminal is a technique for preventing congestion / discarding in the network by transmitting only the available traffic amount according to the information regarding the traffic amount suppression instruction included in the management cell. It also uses a traffic control technique commonly called back pressure.

Also, the paper "Analysis of Basic Characteristics of Back Pressure Congestion Control System" (Journal of the Institute of Electronics, Information and Communication Engineers)
B-I Vol. J78-BI No. 12th 83rd
As described in pages 7 to 845 (December 1995), unlike ABR back pressure, there is one that performs congestion control by suppressing cell transfer not between terminals but between ATM switch nodes. At this time, there is an idea of completely stopping the cell transfer from the preceding node and an idea of stopping the cell transfer for each VC.

Although traffic prediction has not been generalized in general, the mainstream is that the traffic inside the device is always measured and the accumulated data is analyzed by various methods (generally, learning and Calling), the current traffic situation is applied to the learning result to predict the upcoming traffic.

[0007]

However, in the above-mentioned ABR class congestion control method, the traffic control in the network performed by the ATM switch node is delegated to the transmitting terminal, so that the transmitting terminal side There was a problem that the load would be heavy. In addition, the congestion control method is sometimes used for ABR, and naturally VB
It cannot be applied to congestion control of traffic that requires real-time processing in other quality classes such as R.
In fact, in the case of VBR, the quality after being checked by UPC depends on the luck before leaving the network.

Regarding the back pressure, if the transfer is completely stopped as in the conventional case, congestion is likely to occur in the buffer there and congestion propagation occurs, and even VCs unrelated to congestion are affected. It will be extended. In order to prevent this, cell transmission is stopped for each VC, but a substantial amount of H / W is required to realize this, which is not realistic.

Further, in the case of the prediction that requires the learning function as described above, not only the function of monitoring the traffic volume but also a high-level program for processing it must be installed in the main processor. However, a considerable amount of H / W is required such as a decrease in performance or an increase in memory amount.

Further, the traffic flowing in the ATM network has a traffic characteristic corresponding to one of four quality classes, but only the ABR is a concrete target of congestion control other than priority control. Has become V
BR is not considered.

The present invention has been made to solve the above problems, and an object thereof is to provide an ATM communication system for predicting the occurrence of bursts and preventing cell congestion / discarding as much as possible. To provide.

[0012]

In order to achieve the above object, the ATM communication system according to the present invention uses an ATM switch node including traffic monitoring means for monitoring the traffic volume of cells at the entrances of a plurality of VCs. In the constructed ATM network, the traffic monitoring means is characterized in that only the online information of each VC to which the cell is sent is monitored in real time and the occurrence of congestion is predicted based on the online information.

Further, the traffic monitoring means is a UPC.
It is characterized by being.

[0014] Further, it has a traffic predicting means for predicting the occurrence of congestion based on the online information, and the traffic predicting means predicts the VC which causes the occurrence of congestion based on the online information and makes the prediction. It is characterized in that only the VC is targeted for traffic volume suppression.

Further, the burst size is used as online information.

The VBR class traffic amount is used as online information.

Further, it is characterized in that burst prediction is performed according to the ratio of the burst size to the MBS.

Further, the traffic predicting means notifies the traffic volume suppression instruction information to the VC targeted for traffic volume suppression.

The allowable cell rate calculated on the basis of the traffic parameter of each VC is used as the traffic amount suppression instruction information.

Also, in an ATM network constructed by an ATM switch node including a buffer for temporarily storing cells sent from a plurality of VCs and a priority control means for realizing a delay priority control function using the buffer. The priority control means performs peak rate shaping based on a suppression rate value determined by a traffic volume suppression instruction from an ATM switch node at a subsequent stage.

Further, the buffer has a quality class queue set for each quality class, and a virtual queue provided corresponding to each quality class queue, and the priority control means is provided with traffic from an ATM switch node at a subsequent stage. When receiving a traffic volume suppression instruction, a cell that occurs thereafter is written in the virtual queue until the traffic volume suppression cancellation instruction is received, and the self-rate regulation is performed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. In each figure, the same components are designated by the same reference numerals.

FIG. 1 is a diagram showing a part of an ATM network to which an embodiment of an ATM communication system according to the present invention is applied. The ATM network to which this embodiment is applied can be applied to a private or public system,
The form is the same as the conventional one, and is constituted by a plurality of ATM switch nodes 10, 11, 12, 13 and physical communication lines 30, 31, 32 connecting the respective ATM switch nodes and having a capacity of 155 Mbps. It In this configuration, a VC passing through any ATM switch node and communication line is formed to transfer data between terminals.

FIG. 2 shows the configuration of the ATM switch node 13 which constitutes the ATM network, together with the main parts of the adjacent ATM switch nodes 10-12. Note that the ATM switch nodes other than the ATM switch node 13 forming the ATM network have the same structure, but constituents unnecessary for explanation are omitted from the drawing. Here, the configuration of the ATM switch node 13 will be described as a representative. The ATM switch node 13 is provided for each communication line, is formed inside the switch of the UPC 40, 41, 42 as a traffic monitoring means for monitoring the traffic volume of the cell at the entrance of the VC, and temporarily stores the cell. Buffer 23 and cell routing / multiplexing unit 63
And a processor 53 that operates as a traffic predicting unit that controls the entire node such as connection admission control and congestion / discard control, and that predicts the occurrence of congestion based on online information. Of these, the buffer 23 is one of the line output buffers inside the ATM switch node 13. Like the other buffers 20 to 22, the buffer 23 has a class capable of shaping only at the peak rate, and further has a function of switching / returning only cells of a specific VC to another delay priority class. This is a buffer with class delay priority control function. The cell routing / multiplexing function unit 63 multiplexes cells input from each line at the entrance of the buffer 23. In addition, the UPCs 40 to 4 in the present embodiment
2 performs a traffic monitoring function for VBR calls passing through the communication lines 30 to 32. However, that function only monitors the burst size, which is online information, and does not perform CLP rewriting or discarding of the violating cell. The burst size being monitored is referred to by the processor 53 inside the ATM switch node 13.

Further, in FIG. 2, the communication line 30 includes
A VBR class call (VBR-VC) A03 and B03 passing through the buffer 20 and the buffer 23 is set. In addition, A13 of VBR-VC passing through the buffer 21 and the buffer 23 is provided on the communication line 31,
Similarly, the communication line 32 includes a buffer 22 and a buffer 23.
A23, B23 and C23 of VBR-VC passing through
Is stretched.

FIG. 3 shows the SCR and PC of each VBR-VC.
Specific numerical examples of R and MBS are shown in the table.
According to FIG. 3, when a CBR call and some ABR and UBR calls for a total of 20 Mbps are placed in the buffer 23, at least the cell rate to be guaranteed in the buffer 23 (minimum required cell rate) is 2 above.
The sum of SCR of each VCR-VC (80M
bps) is added to 100 Mbps, and the maximum requested cell rate in the buffer 23 when a burst occurs is 20 Mbps above the PCR of each VCR-VC.
The total value is 210 Mbps, which is 230 Mbps.

A characteristic of this embodiment is that U
The PCs 40 to 42 do not perform the CLP rewriting or discarding operation of the violating cell but only monitor the rate and the burst size which are online information, and the processor 53 predicts the occurrence of congestion based on the online information, This is to notify the burst suppression instruction only to the VCs that require the adjustment of the traffic volume.

Next, an operation example of the VBR class cell congestion prediction / discard suppression function which is a feature of this embodiment will be described below.

It is assumed that the cell filling degree of the buffer 23 exceeds a certain value and the burst size as online information monitored by the UPC of each VBR has a value shown in FIG. In this case, if bursts occur simultaneously in A13, B03, B23, and C23 of VBR-VC, the total value of the PCRs of each VBR-VC becomes 160 Mbps, so the line capacity is simply 1
It is expected to exceed 55 Mbps. Moreover, the current burst size is 5% for A13, 0% for B03, 0% for B23, and 10% for C23 for each MBS, so cell transmission may occur in MBS in the near future. It has a very high quality. Therefore, each ATM switch node in the preceding stage is notified by a control frame so as to prepare for burst suppression as a traffic suppression instruction for these VBR-VCs. In the present embodiment, the burst size is monitored in real time and M
It is characterized by predicting the transmission of cells to the BS and forming a control frame to notify the burst suppression instruction to the preceding stage. The control frame will be described later.

Here, A03 of VBR-VC shows that the burst size is 0% with respect to MBS, and there is a high possibility that a burst will be held in the near future.
Since the absolute values of CR and MBS are small, it is considered that the effect on the congestion / discarding in the buffer 23 is actually small. A23 is relatively large in both PCR and MBS and has a large effect on congestion / discard in the buffer 23, but since the burst size is currently 90%, it is unlikely that there will be a burst in the near future, so after all, Since it is considered that the possibility of giving congestion / discarding in the buffer 23 in the near future is low, it is not a target VC for burst suppression control. Therefore, in the present embodiment based on the numerical example shown in FIG. 3, B03, A13, B23, and C23 of VBR-VC excluding A03 and A23 are specified as burst suppression targets.

Processor 5 of ATM switch node 13
3, when the control target VC such as B03 is specified from the burst size of each VBR-VC being monitored as described above, the suppression rate is determined based on the traffic parameter of each control target VC, that is, SCR, PCR, and MBS in the quality information. In order to obtain the value, the calculated additional rate is calculated as follows. The calculated additional rate means each VBR-VC.
It is a value indicating how much the cell flow rate from SCR is allowed to exceed the cell rate from SCR, and can be said to correspond to tentative PCR in the control target VC.
The value corresponding to this tentative PCR is the suppression rate value, and S
It is obtained by adding the calculated addition rate to CR. The calculated values in the process of calculating the calculated additional rate are shown in FIG. 4, and the procedure is shown in the flowchart of FIG.

First, in the buffer 23, the difference (ps _n ) between the PCR and SCR of each VC to be controlled and the MBS (m
The total value (mbs_sum) of bs _n ) is calculated (step 101). Next, the parameter (p1 _n ) of each control target VC is calculated by the calculation formula shown in FIG. 5 (step 102). This calculation formula is the burst area, that is, (P
CR-SCR) and the reciprocal of MBS, (PCR-
It is set so that it is large when SCR) is large and small when MBS is large. That is, S of each control target VC
The calculated addition rate to be added to the CR is set to be smaller as the MBS is larger and as the difference between SCR and PCR is smaller. The reason for this is that if the rate value of a large MBS is increased, there is a greater possibility that it will be discarded.
This is because if the difference between R and PCR is reduced, the effect on cell delay increases. Then, the total value (p1_su) of the parameters (p1 _n ) of each control target VC is acquired.
m) is calculated (step 103), and the line capacity (1
A value (rem_rate) obtained by subtracting the minimum guaranteed request cell rate (100 Mbps) from 55 Mbps).
= 55 Mbps) is calculated (step 104). Then, the calculation addition rate of each control target VC is calculated by the calculation formula shown in FIG. 5 (step 105). In this way,
The calculated additional rate can be obtained.

In the present embodiment, the control object VC is selected due to the influence on the buffer, and the calculated additional rate of each control object VC is obtained by using the above formula by the above procedure. You may set and use a different formula. Briefly, the above procedure is rem_su
It is a procedure for allocating the value of m to each of VCR-VC, and merely shows how to determine the ratio.

Here, the control frame will be described.
FIG. 6 is a diagram showing the data structure of the control frame in the present embodiment. In the control frame, traffic amount suppression instruction information is stored as a burst suppression instruction to be notified. In FIG. 6, in the control frame display field, identification information indicating that the frame is a control frame unlike other frames is set. In the VPI / VCI field, the VPI / VCI of the VC to be controlled is set. In the total rate field, the total value of the calculated additional rates for each ATM switch node is set. For example, AT
In the total rate field of the control frame sent to the M switch node 12, "52.6" which is the sum "24.6" of the calculated additional rates of B23 and C23 and the sum "28" of the SCR is set. It will be. Since the A23 is not a control target, the calculated addition rate is "0".

Then, a flag "1111b" indicating the final data at the beginning of the final field of the VC included in the calculated additional rate field, and a flag indicating intermediate data at the beginning of the non-final field of the VC. “0000b” is set respectively.

ATM in front of the ATM switch node 13
The switch nodes 10 to 12 are ATM switch nodes 1
When the control frame is received from the communication control unit 3, the traffic control is performed according to the burst suppression instruction. Before the description, the line output buffers 20 to 23 of each switch will be described.

Each of the line output buffers 20 to 23 is a common buffer type cell queue memory in which a plurality of FIFO type memories are virtually realized by one physical memory. In the normal state, as shown in FIG. 7, "CBR cell queue",
"VBR cell queue", "ABR cell queue" and "U"
There are four types of queues of "BR cell queue", and the delay priority control is performed in this order.

The temporary queues 70 and 71 shown in FIG. 7 are virtual queues that are temporarily generated only when the control state is entered. Of these, the temporary queue 70 has a delay priority of V.
Higher than BR class and lower than CBR class. Temporary cue 7
1 has a lower delay priority than the VBR class and ABR.
Higher than class. It should be noted that both the temporary queues 70 and 71 can simultaneously exist for the number of accommodated lines of the switch to which the line of each buffer is connected. Further, the priority orders of the temporary queues 70 and 71 that are present at the same time must be at the same level. In addition, the temporary queue 70
Corresponds to the shaping function realized by the shaper 73.

Each switch has a temporary queue 70, which is a virtual FIFO queue of each line output buffer 20-23.
71 has a controller 74 for realizing
Each queue has its own register as shown in FIG. Each register is composed of 8 bits, and the upper 4 bits are used as a comparison target in the controller 74.
The upper 2 bits of the comparison target bits indicate the quality class. In this embodiment, the CBR class is "00", the VBR class is "01", the ABR class is "10", and the UBR class is "11". The remaining lower 2 bits always indicate "0" except for the VBR class. In VBR class, “10” in normal time, temporary queue 7
It is sequentially set to "00" at 0 and "11" at the temporary queue 71. Register numbers are written in the remaining lower bits other than the comparison target bits. Therefore, the queue is 16
Up to types can exist simultaneously, CBR, V
Since four queues are reserved in each of the BR, ABR, and UBR queues, the number of accommodated lines in the ATM switch node in the subsequent stage is required to be 12 or less.

The controller 74 compares the upper 4 bits of each register corresponding to the queue in which the cell exists or the cell exists and the transmission is permitted from the shaper 73, and selects the one having the smallest value. , Send cells in that queue. As a result, priority control and queue control involving shaping can be performed.

Each of the ATM switch nodes 10 to 12 having the above-mentioned switch is an ATM switch node 13
Traffic control is performed when a control frame is received from. Next, the queue switching / restoring method performed as the traffic control will be described with reference to the queue transition diagram shown in FIG. Since it does not affect the CBR, ABR, and UBR classes, VBR, temporary queues 70, 71
Will be described only.

FIG. 8A shows a normal VBR queue state before a control frame including a burst suppression instruction is sent from the ATM switch node at the subsequent stage. FIG.
(B) shows the state immediately after receiving the control frame from the ATM switch node at the subsequent stage. First, a temporary queue that is not currently used is selected, and its priority class is set to the next priority class immediately after the original VBR class, like the temporary queue 71. In the present embodiment, a temporary queue is generated in advance, and an unused temporary queue is selected as needed and used as the temporary queue 71 in this processing. Then, after setting the cell of the VC to be controlled to be written to the temporary queue 71 in the future, the original VBR is set.
Write a control cell to the queue. In this way, the temporary queue 7
By providing 1, it is possible to prevent the cell from being discarded in the switch that is performing the traffic control according to the traffic volume suppression instruction from the ATM switch node in the subsequent stage.

The present embodiment is characterized in that a temporary queue is provided and traffic control is performed using the temporary queue, and the timing of generation and disappearance of the temporary queues 70 and 71 is designed. It is a matter. Therefore, the system design according to the usage environment or the like may be performed by appropriately generating the temporary queue without generating it in advance. The control cell is
Idle cells that do not normally exist in the ATM switch node are used. The identification information as the control cell may be set appropriately in the cell.

FIG. 8C shows the original VBR queue as shown in FIG.
The moment when the control cell written in (b) is read from this VBR queue is shown. The fact that the control cell is read out means that the queued cell is transmitted and no cell of the control target VC remains in the VBR queue.

FIG. 8 (d) shows the operation when the shaping by PCR is started. After the state of FIG. 8C, the temporary queue 71 is reset to the priority class immediately above the VBR class. That is, the temporary queue 71 is handled as the temporary queue 70. At the same time, the peak rate shaping is started by the suppression rate value obtained by the calculated additional rate given in advance by the control frame.

FIG. 8E shows the processing after receiving the recovery notification from the ATM switch node at the subsequent stage. When the control frame whose total rate field value is "0" is notified that the congestion state is recovered in the buffer 23 at the subsequent stage, the mode in which the disappearance of the cells in the temporary queue 70 is monitored is entered. The temporary queue 70 has a priority next to that of the CBR, and the sum of SCRs of the target VCs set in the CBR and the temporary queue 70 cannot exceed the line requirement. Therefore, when the cells in the temporary queue 70 are exhausted as they are, they are always reached.

FIG. 8F shows the processing when the temporary queue 70 becomes empty. The cell of the VC to be controlled is shown in FIG.
The temporary queue 70 becomes empty eventually because it is written in the VBR queue by the processing in (g). Immediately after this, the cell of the control target VC is written in the original VBR queue.

FIG. 8G shows a state in which the temporary queue is removed and the original state, that is, the state shown in FIG. 8A is returned. The above is the operation of the buffers 20 to 23.

As described above, each switch receiving the control frame immediately executes the operation corresponding to the content of the frame. Then, the state is retained at the point up to FIG. After that, when the control frame of the congestion recovery notification is received from the switch in the subsequent stage, the operation shifts to the operation of FIG. 8E, and finally the temporary queue 70 is removed from the target of the priority control and the original state is restored.

As described above, according to the present embodiment, even when a burst occurs in all of the control target VCs, the ATM switch node of the preceding stage is notified of the burst suppression instruction. Therefore, the ATM switch node of the preceding stage is notified. It is possible to suppress the cell transfer amount from the line capacity value of the buffer at the subsequent stage. For this reason, the delay of each cell becomes large, but congestion and discard in the buffer at the subsequent stage are suppressed. In addition, as an effect of the VBR-VC burst, AB
Although it affects quality classes with lower delay priority than VBR, such as R and UBR, it prevents cells in the ABR and UBR quality classes from generating bursts of VBR traffic, which is the higher priority class of ABR and UBR. It also has the effect of suppressing disposal. Therefore, it is particularly effective for a quality class in which discard quality is also required, such as ABR. Further, by the queue switching method of the specific VC by generating the temporary queue, it is possible to realize the congestion / discard control without affecting the cells of the VC unrelated to the congestion at all. Also, unlike when you stop completely,
Even for the VC to be controlled, cells are constantly discharged at a cell rate equal to or higher than the SCR of VBR. Therefore, discarding can be suppressed even with a relatively small buffer.

Although the UPC is used as the traffic monitoring means in the above embodiment, the present invention is not limited to the NP.
The case of C is also applicable.

[0052]

According to the present invention, the CL originally possessed by the traffic monitoring means arranged at the entrance of the ATM switch node.
Since traffic control such as P rewriting and cell discard is not performed, only online information such as burst size is monitored, so that congestion and cell discard occur inside the ATM switch node based on the online information. It is possible to predict the VC in such a situation. In particular, by monitoring the burst size in real time, it is possible to predict a VC in which cell transmission is likely to occur in MBS in the near future.

Further, only VCs that are considered to require adjustment of the traffic volume in order to prevent such congestion / discard are set as control targets, and the load on the traffic predicting means can be reduced. It is possible to reduce the influence of the delay increase on VCs other than the control target as much as possible.

Further, since it is possible to notify in advance the traffic volume suppression instruction to the ATM switch node at the preceding stage through which the control target VC passes, the A at the preceding stage which has received the notification.
Traffic control can be performed in the TM switch node. As a result, the amount of cells transferred from the ATM switch node at the preceding stage can be suppressed to the line capacity value of the buffer, so that it is possible to prevent expected congestion and discard.

Also, congestion control by the feedback function can be realized in VBR classes other than the ABR class.

Further, the ATM switch node which has received the traffic volume suppression instruction from the ATM switch node at the subsequent stage is provided with a temporary queue and the priority control is performed by the queue control including this temporary queue. It is possible to continue transmission within the suppression rate value according to the traffic volume suppression instruction from the latter stage by shaping instead of stopping. In addition, since the congestion / discard control is performed by controlling the rate of the control target VC by shaping by paying attention to the VBR traffic characteristics, the quality class (AB class with lower delay priority than VBR is used.
It will also be possible to limit the impact on waste quality on R, UBR).

[Brief description of drawings]

FIG. 1 is an AT to which an ATM communication system according to the present invention is applied.
It is a figure showing an example of connection of an ATM switch node which constitutes M network.

FIG. 2 is a diagram showing a configuration of an ATM switch node shown in FIG.

FIG. 3 is a diagram showing a numerical example of traffic parameters in the present embodiment.

FIG. 4 is a diagram showing a calculated additional rate calculated based on the traffic parameters shown in FIG. 3 and a calculated value in the calculation process.

FIG. 5 is a flowchart showing a procedure for calculating a calculated additional rate according to the present embodiment.

FIG. 6 is a diagram showing a data structure of a control frame in the present embodiment.

FIG. 7 is a diagram showing a configuration of a switch according to the present embodiment.

FIG. 8 is a diagram showing state transition due to rate shaping of the line output buffer in the present embodiment.

[Explanation of symbols]

10, 11, 12, 13 ATM switch nodes, 2
0, 21, 22, 23 buffer, 30, 31, 32 communication line, 40, 41, 42 UPC, 53 processor, 63 cell routing / multiplex function unit, 70, 71
Temporary cue, 73 shaper, 74 controller.

Claims (10)

[Claims] 1. In an ATM network constructed by an ATM switch node including traffic monitoring means for monitoring the traffic volume of a cell at the entrance of a plurality of VCs, said traffic monitoring means is provided for each VC to which a cell is sent.
ATM communication system characterized in that only the online information of the above is monitored in real time and the occurrence of congestion is predicted based on the online information. 2. The ATM communication system according to claim 1, wherein the traffic monitoring means is UPC. 3. A traffic predicting means for predicting the occurrence of congestion based on online information, wherein the traffic predicting means predicts a VC that causes the occurrence of congestion based on the online information, and predicts the VC. V
The ATM communication system according to claim 2, wherein only C is targeted for traffic volume suppression. 4. The ATM communication system according to claim 1, wherein the burst size is used as online information. 5. The ATM communication system according to claim 1, wherein the traffic volume of VBR class is used as online information. 6. The ATM communication system according to claim 4, wherein burst prediction is performed based on a ratio of a burst size to MBS. 7. The ATM communication system according to claim 3, wherein the traffic prediction means notifies the traffic amount suppression instruction information to the VC targeted for traffic amount suppression. 8. The ATM communication system according to claim 7, wherein an allowable cell rate calculated based on a traffic parameter of each VC is used as traffic amount suppression instruction information. 9. An ATM network constructed by an ATM switch node including a buffer for temporarily storing cells sent from a plurality of VCs, and priority control means for implementing a delay priority control function using the buffer. The priority control means performs peak rate shaping with a suppression rate value determined by a traffic amount suppression instruction from an ATM switch node at a subsequent stage. 10. The buffer comprises: a quality class queue set for each quality class; and a virtual queue provided corresponding to each quality class queue, wherein the priority control means is provided from an ATM switch node at a subsequent stage. 10. The ATM communication system according to claim 9, wherein when a traffic volume suppression instruction is received, a cell generated thereafter is written in a virtual queue until a traffic volume suppression cancellation instruction is received, and the self-rate regulation is performed.