JPH08237262A - ATM communication network and transmission terminal device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the bandwidth utilization of the virtual path without increasing the buffer capacity. A first class of priority classes and a second class of non-priority classes are provided, and the cell transfer rate of the second class is increased or decreased according to the bandwidth utilization rate of the virtual path to reduce the invalid bandwidth. When the second class cell transfer rate is required to be regulated, the subscriber circuit in which the transmission source of the cell is accommodated is notified and the transfer rate is regulated. The notification is made by the speed regulation cell. [Effect] Since it is possible to provide a high quality service and a low quality service, it is possible to effectively use the bandwidth of the virtual path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in an asynchronous transfer mode communication network (hereinafter referred to as an ATM communication network). The present invention relates to a technique for controlling cell flow based on a contract made between a communication carrier and a subscriber.

[0002]

2. Description of the Related Art The ATM (Asynchronous Transfer Mode) communication method is a method of transferring a fixed-length packet composed of a 5-byte header called a cell and a 48-byte payload. In an ATM communication network, it is possible to transfer information having different traffic characteristics such as voice, video and data or different quality requirements with high speed at the same network.
In the ATM communication network, virtual channels (VC) corresponding to individual lines are accommodated in virtual paths (VP) which are virtual paths.

As a method of guaranteeing cell transfer quality for virtual channels, a method of fixedly allocating a band corresponding to the maximum rate declared by the user to each virtual channel is considered. In this method, since the band is fixedly allocated according to the maximum cell transfer rate, the cell transfer quality can be easily guaranteed for the virtual channel which is once permitted to be connected and transfers the cell at the declared maximum rate or less.

[0004]

However, when traffic having a large burst is transferred, the band not used for cell transfer becomes large and the band of the virtual path cannot be effectively used. For example, a virtual speed of 45 Mbps and a peak speed of 1.5 Mbps and an average speed of 0.15 M
When the maximum number of 30 bps virtual channels is accommodated, only about 10% of the virtual path bandwidth is used on average.

The present invention has been made against such a background, and an object of the present invention is to provide an ATM communication network and a transmission terminal device capable of providing a high quality service and a low quality service. . An object of the present invention is to provide an ATM communication network and a transmission terminal device capable of improving the usage rate of the virtual path band without increasing the buffer amount. SUMMARY OF THE INVENTION It is an object of the present invention to provide an ATM communication network and a transmission terminal device capable of quickly controlling the cell transfer rate in a cell transmission terminal.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a means for transmitting a speed control signal provided in a switch section of an ATM exchange (hereinafter referred to as an exchange), a means for connecting the switch section and a subscriber circuit, and a subscription. By means of changing the threshold of the cell transfer rate of the second class provided in the third party circuit, in the switch unit, the length of the cell queue is monitored, if the cell queue becomes long and cell discard is expected, By discarding arriving cells of the second class, a buffer for accumulating cells of the first class is secured, and a speed regulation signal is sent to the subscriber circuit accommodating the virtual channel of the second class, and the virtual circuit of the second class is sent. The cell transfer rate of the channel is regulated in the subscriber circuit.

Further, according to the present invention, the means for changing the threshold value of the cell transfer rate of the second class virtual channel provided in the subscriber circuit, when the rate control cell is received, the usage parameter control circuit (hereinafter, The maximum cell transfer rate is declared by the user when the cell queue of one or more buffers on the virtual channel path becomes long by temporarily increasing the minimum cell interval that the UPC circuit can pass through. It is characterized in that the speed is regulated to the second maximum speed.

Further, the quality of cell transfer based on the second maximum value is guaranteed even when the speed control is applied to the second class virtual channel. Alternatively, it is effective that the subscriber circuit sends information for traffic control between terminals by sending a speed regulation signal to the transmitting terminal.

That is, a first aspect of the present invention is an ATM communication network, which is characterized in that a transmission terminal accommodated in an ATM exchange via a virtual path has a cell transmission speed up to one maximum value. Use of the bandwidth of the virtual path is divided into a first class that is allowed and a second class that is provided with a first maximum value and a second maximum value that is lower than that and that allows the cell transmission rate up to this second maximum value. When the rate is small, the virtual path is divided by setting the speed exceeding the second maximum value in the range not exceeding the first maximum value for the cells transmitted from the transmission terminal classified into the second class. It is equipped with a control means. The first maximum value can also be the physical transmission rate. Here, the physical transmission rate refers to the highest physically transmittable rate. That is, it means a state in which the upper limit value is not provided for the first maximum value. As a result, the free bandwidth of the virtual path can be reduced and the virtual path can be effectively used.

When the bandwidth utilization rate of the virtual path is high, the control means sets the transmission speed to the first when a cell having a speed exceeding the second maximum value is transmitted from the transmission terminal classified into the second class. It is desirable to include a means for restricting the allocation of virtual paths so that the virtual maximum value is equal to or less than the maximum value.

It is also possible to provide a buffer for temporarily storing cells that are restricted by the restriction means and are not transferred. As a result, the number of discarded cells can be reduced.

The regulating means may be configured to include means for discarding the cells accumulated in the buffer when the cells arrive beyond the storage capacity set in the buffer.

The control means and the buffer are preferably provided in a subscriber circuit. In the ATM communication network in which the control means and the buffer are provided in the subscriber circuit, a detection means for detecting that the bandwidth usage rate of the virtual path has reached a state where regulation is required,
The detection output of the detection means is the AT having the subscriber circuit.
Transfer means for transferring as speed regulation information to the M switch is provided in the network, and the control means includes means for regulating allocation of virtual paths according to the speed regulation information.

In this ATM communication network, the subscriber circuit may be configured to include means for transmitting speed regulation information to a transmission terminal that transmits a cell regulated by the information. As a result, the cell sending speed can be quickly regulated at the transmitting terminal.

The speed regulation information is preferably the speed regulation cell that has received the transfer.

A second aspect of the present invention is a transmission which is connected to this ATM communication network and which has means for controlling the cell speed of the transmission to the communication network in accordance with the speed regulation information coming from the communication network. It is a terminal device.

[0017]

A single maximum value is set in the first class, and a transmitting terminal belonging to the first class can transfer cells within a range that does not exceed this single maximum value. The ATM communication network also guarantees this cell transfer rate.

A first maximum value and a second maximum value lower than that are set in the second class, and as long as a transmitting terminal belonging to the second class transfers cells within a range not exceeding the second maximum value, A
The TM communication network guarantees this transfer rate.

However, when the bandwidth utilization ratio of the virtual path established between the ATM switching apparatus accommodating the transmission terminals belonging to the first class and the second class is small, the transmission terminal belonging to the second class is It is allowed to transfer cells beyond the two maximums. The upper limit value at this time is the first maximum value, but the first maximum value may be the physical transmission rate. The transmission terminals belonging to the first or second class do not necessarily have to be different in terms of hardware.

In the switch unit of the exchange, when the cell queue becomes long, the second-class arriving cells are discarded, and the cell transfer rate of the second-class virtual channel is regulated so that the buffer amount is not increased. In addition, it is possible to prevent the first class cell discard.

At this time, the cells of the second class to be discarded can be temporarily stored in the buffer and controlled to be transferred at a transfer rate equal to or lower than the second maximum value. As a result, it is possible to reduce the amount of cells discarded in the second class, reduce the number of retransmissions, and effectively use the virtual path.

The control means and the buffer are preferably provided in the subscriber circuit. This subscriber circuit may also be included in the exchange. When the bandwidth usage rate of the virtual path reaches a state where regulation is required, the exchange that requires it sends out a rate regulation cell to this subscriber circuit. In this way, by regulating the cell transfer rate at the subscriber circuit that is the entrance and exit of the ATM communication network,
It is possible to increase the free bandwidth of the virtual path and accommodate a larger number of virtual channels without transferring cells discarded in the network.

As described above, even when the second class speed regulation is performed, the minimum necessary information can be transferred between the terminals, so that the congestion can be avoided by the traffic control between the terminals and the switch of the exchange. It is possible to prevent the discarding of the second class cell without increasing the buffer amount of the unit.

Further, since the subscriber circuit transmits the speed regulation signal to the transmitting terminal, the transmitting terminal can control the traffic faster and prevent the deterioration of the cell transfer quality.

Further, according to the present invention, the amount of retransmission of the transmitting terminal is reduced by accumulating cells arriving within the minimum cell interval that can pass through the UPC circuit in the subscriber circuit without discarding them and sending them out at the minimum cell interval. , It becomes possible to effectively use the subscriber line.

Further, by making the second class speed regulation release threshold value smaller than the second class speed regulation threshold value, the speed regulation operation is less likely to occur immediately after the speed regulation is released, which is effective in simplifying the control.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of an embodiment of the present invention. FIG. 2 is a block diagram of a subscriber circuit. FIG. 3 is a block diagram of the switch unit.

The present invention is an ATM network, which is characterized in that the transmission terminals accommodated in the exchanges A to C via a virtual path have a first class in which the cell transmission speed is allowed up to one maximum value. A second class in which a first maximum value and a second maximum value lower than the first maximum value are provided and the cell transmission rate is allowed up to this second maximum value, and when the bandwidth utilization rate of the virtual path is small, Join as a control means for allocating the virtual path by setting a speed exceeding the second maximum value in a range not exceeding the first maximum value for cells transmitted from a transmission terminal classified into the second class It is provided with the operator circuit 6. This first maximum may be the physical transmission rate.

When the bandwidth utilization rate of the virtual path is high, the subscriber circuit 6 has a transmission rate when a cell having a rate exceeding the second maximum value is transmitted from the transmission terminal classified into the second class. UPC as a means to regulate the allocation of virtual paths so that it is below the second maximum value
A circuit 41 is included.

The shaping unit 43 is provided with a buffer 51 for temporarily accumulating cells that are not transferred by the UPC circuit 41. The shaping unit 43 may be optionally omitted.

The UPC circuit 41 includes means for discarding the cells stored in the buffer 51 when the cells arrive beyond the storage capacity set in the buffer 51.

Further, the switch section 7 includes an output buffer management section 2 as a detection means for detecting that the bandwidth usage rate of the virtual path has reached a state where regulation is required,
A speed regulation signal transmission unit 3 is provided as a transfer unit that transfers the detection output of the output buffer management unit 2 to the exchange A having the subscriber circuit 6 as speed regulation information. In the embodiment of the present invention, this speed regulation information is transferred by the speed regulation cell 10.

The UPC circuit 41 uses the speed regulating cell 10
The allocation of virtual paths is regulated according to.

The subscriber circuit 6 transmits the speed regulation cell 10 to the transmitting terminal which transmits the cell regulated by the speed regulation cell 10.

The transmitting terminal controls the cell speed of transmission to the communication network according to the speed regulation cell.

As described above, the subscriber circuit 6 includes the UPC circuit 41, the speed regulation signal receiving section 42, and the shaping section 4.
It is composed of 3. The UPC circuit 41 includes the control unit 11
And a memory 12 for storing the minimum cell interval when the second maximum value guarantee service is restricted, and a timer 13 for measuring the time for releasing the restriction. The subscriber circuit 6 includes a speed regulation signal receiving section 42 that receives the speed regulation cell 10, and
A timer 13 for measuring the reception interval of this speed regulation cell 10
When the reception interval of the speed regulation cell 10 is longer than the predetermined reception interval, the regulation is released.
This subscriber circuit 6 is provided in the ATM exchange A.
Further, the subscriber circuit 6 is provided with a shaping unit 43 in order to transmit cells arriving at less than the minimum cell interval that can pass the UPC circuit 41 into the network at the minimum interval that can pass the UPC circuit 41. The shaping unit 43 includes a buffer 51 and a timer 52.

The output buffer 1 of the switch unit 7 stores cells for each virtual path. The counter 23 counts the number of cells accumulated in the output buffer 1. The speed regulation signal transmission unit 3 transmits a speed regulation cell 10 that regulates the cell transfer rate to the subscriber circuit 6 in which the transmission source of the cell belonging to the second class is accommodated. The count value of the counter 23 is provided with a transfer rate regulation threshold value, and when this count value exceeds the transfer rate regulation threshold value, the rate regulation signal transmission unit 3
Sends the speed regulating cell 10 to the subscriber circuit 6 by the speed regulating cell inserting section 5.

The transmitting terminal connects the receiving terminal with the virtual channel S to transfer information. The virtual channel S is a second maximum value guarantee service. The virtual channel S passes through the exchange A, the exchange B, and the exchange C. The exchange A is composed of a subscriber circuit 6 and others. The exchange B is composed of a switch section 7 and others. Of the constituent parts of the exchanges A to C, constituent parts which are not necessary for explaining the embodiment of the present invention are omitted. To the virtual channel S, a virtual channel R in the opposite direction via the same exchanges A to C is connected.

For example, as indicated by the point A, when quality deterioration due to cell discard is expected in the output buffer 1 of the switch unit 7 of the exchange B, the switch unit 7 keeps the speed regulating cell 10 constant on the virtual channel R. Send at intervals. When the subscriber circuit 6 receives the speed regulation cell 10, the subscriber circuit 6 regulates the maximum cell transfer rate at which passage is permitted to the second maximum value declared.

FIG. 1 shows a set of virtual channels R and S.
Although only shown, even if there are a plurality of sets of virtual channels, similar control can be performed for each virtual channel.

In FIG. 1, an example is shown in which the switch 7 of the exchange B has a long cell queue. For example, the exchange A or C, which exchange A ... Similar control is performed when quality deterioration due to cell discard is expected in C.

As shown in FIG. 3, the output buffer 1 is a buffer that temporarily stores cells to be output. The output buffer management unit 2 controls the output buffer 1. The output buffer management unit 2 includes a control unit 21, a memory 22 that stores a threshold value, and a counter 23 that counts the number of cells stored in the output buffer 1. The speed regulation signal transmitter 3 transmits the speed regulation signal to the subscriber circuit 6 of the virtual channel R of the second maximum value guarantee service. Speed regulation signal transmitter 3
Is composed of a control unit 31, a memory 32 that stores the state of each buffer, and a timer 33 that measures the interval at which the speed regulation cells 10 are transmitted. The speed regulation signal transmission unit 3 is connected to all the output buffer management units 2 of the switch unit 7. Table 4 shows a buffer number, a virtual channel identifier and a virtual path identifier of a virtual channel passing through the buffer, a service rank of the virtual channel, and a virtual channel of the second maximum guarantee service. 3 is a table for associating with the routing information of the virtual channel of FIG. The speed regulation cell insertion part 5 is provided with the speed regulation cell 10
Insert in the opposite direction.

The operation of the output buffer management unit 2 will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the output buffer management unit 2 when a cell arrives. The first maximum value guarantee service is the first class, and the second maximum value guarantee service is the second class. The output buffer management unit 2 starts the operation at the same clock as the buffer input line, and when a cell arrives (S1), it refers to the table 4 to determine the service class (S2). In the case of the first class, if the value of the counter 23 is less than the buffer size (S12), the arrival cell is accumulated (S4), and "1" is added to the counter 23 (S5). If the value of the counter 23 is equal to the size of the output buffer 1 (S12), the arriving cell is discarded (S).
13). In the case of the second class, if the value of the counter 23 is less than the second class discard threshold (S3), the arrival cells are accumulated (S4), and "1" is added to the counter 23 (S).
5). If the value of the counter 23 is greater than or equal to the second class discard threshold (S3), the arriving cell is discarded (S13).

After the cell accumulation or when there is no cell arrival, if the value of the counter 23 is less than the speed regulation threshold value (S6), and if it is not the speed regulation state (S14), the operation is terminated (S17). . If the value of the counter 23 is less than the speed regulation threshold value (S6) and is in the speed regulation state (S7), the stop signal is sent to the speed regulation signal transmission unit 3 (S).
8) After receiving the stop confirmation signal, the restricted state is released (S9), and the operation ends (S10). If it is equal to or higher than the speed regulation threshold value (S6) or if the cell is discarded (S13), an activation signal is transmitted to the speed regulation signal transmitting unit 3 (S15), and when the activation confirmation signal is received, the regulation state is set ( S16). The start signal or the stop signal includes the buffer number.

Next, the operation of the speed regulation signal transmitting section 3 will be described with reference to FIG.
Will be described with reference to. FIG. 5 is a flowchart showing the operation of the speed regulation signal transmitter 3. Speed regulation signal transmitter 3
Receives an activation or stop signal of the output buffer management unit 2 to start the operation (S20).

The signal type is judged and if it is a start signal (S2
1) Referring to the table 4, the routing address is searched from the buffer number, and the speed regulation cell 10 is transmitted from the speed regulation cell inserting section 5 (S22). After that, the activation confirmation signal is returned to the output buffer management unit 2 (S23), and the timer 33 is started (S24). When the timer 33 becomes equal to or longer than a predetermined cell transmission interval (S2
6) Then, the speed regulation cell 10 is transmitted again (S27), and the timer 33 is restarted (S24). If a stop signal is received during this period (S25), a stop confirmation signal is returned to the output buffer management unit 2 of the corresponding number (S25).
28) and ends the operation (S29).

In the memory 22 of the output buffer management unit 2,
The second class discard threshold is stored. The memory 32 of the speed regulation signal transmission unit 3 stores a second class speed regulation threshold value. If these thresholds are made equal, the second-class cells that arrive thereafter are discarded at the same time as the transmission of the speed regulation cell 10. Further, if the second class speed regulation threshold is set smaller than the second class discard threshold, the speed regulation cell 1
When 0 is transmitted, the subscriber circuit or the transmission terminal performs speed regulation, and if the speed still does not decrease, the second class discard threshold is reached and discard is performed. Alternatively,
If the second class speed regulation threshold value is set smaller than the second class discard threshold value and the second class speed regulation cancellation threshold value smaller than the second class speed regulation threshold value is set in the memory 32, the speed regulation cell 10 is transmitted. Alternatively, the speed regulation may be executed in the subscriber circuit or the transmission terminal, and the transmission may be controlled so as to stop the transmission of the speed regulation cell 10 when the speed is reduced and becomes less than the second class speed regulation cancellation threshold value.

Next, the operation of the subscriber circuit 6 will be described with reference to FIG. FIG. 6 is a flowchart showing the operation of the subscriber circuit 6. When the speed regulation signal receiving unit 42 receives the speed regulation cell 10, the UPC circuit 41 refers to the memory 12, sets the minimum cell interval to the minimum cell interval at the time of restriction (S31), and starts the timer 13 ( S3
2). At this time, setting the minimum cell interval to the minimum cell interval at the time of regulation is the same as increasing the minimum cell interval, that is, reducing the number of cells transmitted per unit time. When the timer 13 exceeds the predetermined timeout time (S33), the timer 13
If the speed regulation cell 10 is received during the operation of (S3
4) Then, the timer 13 is restarted (S32). If the speed regulation cell 10 is not received, the minimum cell interval is returned to the value before regulation (S35), and the operation is finished (S3).
6).

The UPC circuit 41 measures the arrival cell interval,
The cells arriving at the minimum cell interval or less are discarded, or the cells are accumulated in the buffer 51 of the shaping unit 43, the transmission cell interval is measured by the timer 52, and the cells are transmitted at the minimum cell interval that can pass through the UPC circuit 41.

Further, the subscriber circuit 6 transmits the speed regulation cell 10 to the transmission terminal, so that the transmission terminal equipped with means for controlling the cell speed of transmission to the communication network performs traffic control faster. It is possible to prevent deterioration of cell transfer quality.

Next, the result of evaluation by simulation of the traffic control method using the embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a diagram showing the relationship between the speed control threshold and the cell loss rate in the output buffer 1. The horizontal axis represents the number of virtual channels of the second maximum value guarantee service, and the vertical axis represents the output buffer 1 of the switch unit 7.
Take the cell loss rate at. FIG. 8 shows the parameters used in the simulation. The source traffic is a two-state model for both the first maximum value guarantee service and the second maximum value guarantee service, and the parameters are the same. The number of virtual channels of the first maximum value guarantee service was set to 15, and the number of virtual channels of the second maximum value guarantee service and the value of the speed regulation threshold value were changed.

When the cell loss rate is 10 ⁻⁶ or less, the speed regulation threshold is “93”, that is, the second class discard threshold of 80.
%, The number of virtual channels of the second maximum value guarantee service that can be accommodated is 100. Speed regulation threshold is "5"
8 ", that is, 50% of the second class discard threshold, 1
It is possible to connect 50 virtual channels of the second maximum value guarantee service. At this time, the cell loss rates of the virtual channels of the first maximum value guarantee service are all 10 ⁻⁶ or less. The average throughput of the second maximum value guaranteed service in the subscriber circuit 6 is 1.499 Mbps when the speed regulation threshold is "93" and 100 virtual channels of the second maximum value guaranteed service. Speed regulation threshold is "5"
When the number of virtual channels of the second maximum value guarantee service is 8 ″, the number is 1.451 Mbps. As described above, a high throughput comparable to the maximum speed of 1.5 Mbps can be obtained.

[0053]

As described above, according to the present invention,
It is possible to provide high quality service and low quality service. This makes it possible to improve the usage rate of the bandwidth of the virtual path without increasing the buffer amount.

That is, the quality of a high-quality virtual channel equivalent to the conventional bandwidth guarantee service is guaranteed, and a low-quality virtual channel that is premised on quality assurance between terminals is accommodated in the virtual path. The band can be effectively used. Further, according to the present invention, the cell transmission rate can be promptly controlled in the cell transmission terminal.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a subscriber circuit.

FIG. 3 is a block configuration diagram of a switch unit.

FIG. 4 is a flowchart showing an operation of the output buffer management unit upon arrival of a cell.

FIG. 5 is a flowchart showing the operation of a speed regulation signal transmission unit.

FIG. 6 is a flowchart showing the operation of a subscriber circuit.

FIG. 7 is a diagram showing a relationship between a speed control threshold and a cell loss rate in an output buffer.

FIG. 8 is a diagram showing parameters used for simulation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 output buffer 2 output buffer management unit 3 speed regulation signal transmission unit 4 table 5 speed regulation cell insertion unit 6 subscriber circuit 7 switch unit 10 speed regulation cell 11, 21, 31 control unit 12, 22, 32 memory 13, 33, 52 timer 23 counter 41 UPC circuit 42 speed regulation signal receiving unit 43 shaping unit 51 buffer A, B, C switch R, S virtual channel

Claims (10)

[Claims] 1. A transmission terminal accommodated in an ATM exchange via a virtual path has a first class in which a cell transmission rate is allowed up to one maximum value, a first maximum value and a second maximum value lower than that. It is provided and is sorted into a second class in which the cell transmission speed is allowed up to the second maximum value, and when the bandwidth utilization rate of the virtual path is small, the cells transmitted from the transmission terminal sorted into the second class On the other hand, the ATM communication network is provided with a control means for setting the speed exceeding the second maximum value within the range not exceeding the first maximum value and allocating the virtual path. 2. The ATM communication network according to claim 1, wherein the first maximum value is a physical transmission rate. 3. The control means, when a bandwidth utilization rate of a virtual path is large, when a cell having a rate exceeding the second maximum value is transmitted from a transmission terminal classified into the second class, a transmission rate thereof. 3. The ATM communication network according to claim 1, further comprising means for restricting allocation of virtual paths so that is less than or equal to a second maximum value. 4. The ATM communication network according to claim 1, further comprising a buffer that temporarily stores cells that are restricted by the restricting means and are not transferred. 5. The ATM communication network according to claim 4, wherein the regulation means includes means for discarding cells accumulated in the buffer when the cells arrive beyond the storage capacity set in the buffer. 6. The ATM communication network according to claim 1, wherein the control means and the buffer are provided in a subscriber circuit. 7. The ATM communication network according to claim 6, wherein a detection unit that detects that the bandwidth usage rate of the virtual path has reached a state that requires regulation, and a detection output of the detection unit is the subscriber. A transfer means for transferring as speed regulation information to an ATM switch having a circuit is provided in the network, and the control means includes means for regulating allocation of virtual paths according to the speed regulation information.
TM communication network. 8. The ATM communication network according to claim 6, wherein the subscriber circuit includes means for transmitting speed regulation information to a transmission terminal that transmits a cell regulated by the information. 9. The ATM communication network according to claim 7, wherein the speed regulation information is a speed regulation cell that has received the transfer. 10. A transmission terminal device connected to the ATM communication network according to claim 7, comprising means for controlling a cell speed of transmission to the communication network according to the speed regulation information coming from the communication network.