KR20030056747A - the apparatus and method for ATM cell traffic management using the EFCI tagging - Google Patents

Abstract

PURPOSE: A device for managing ATM cell traffic using EFCI(Explicit Forward Congestion Indication) tagging and a managing method therefor are provided to inform other station that congestion of excessive ATM cells is detected, through the EFCI tagging, and to control a traffic amount according to a fed back control signal received from the other station, thereby preventing ATM cell loss caused by the congestion. CONSTITUTION: An EFCI unit(600) inputs cell count data and queue depth state information of an ATM cell storage queue(400), compares the inputted data and the information with a preset threshold value and prestored queue depth state information, and performs an EFCI tagging process in an ATM cell if cell congestion is generated, then transmits the queue depth state information through an ATM cell output unit(700). If EFCI tagging data exist in ATM cell information of the other station, a queue controller(300) transmits ATM cell traffic reduction control information to the other station, and performs queue write reduction, suspension, and port conversion processes.

Description

The apparatus and method for ATM cell traffic management using the EFCI tagging}

The present invention relates to an ATM cell traffic management apparatus using tagging (Explicit Forward Congestion Indication (hereinafter referred to as EFCI)) and its management method, and more specifically, to each input and output port in an asynchronous transmission mode system An ATM cell traffic management apparatus using EFCI tagging to monitor the transmission bandwidth of ATM cells transmitted / received in advance and to detect the inflow (congestion) of excessive ATM cells in advance and to eliminate the loss of valid ATM cells through EFCI tagging. It is about.

1 is a system block diagram illustrating a general asynchronous transfer mode system (hereinafter referred to as ATM system). In general, the connections between systems in an ATM system are connected to multiple physical layers, and are mainly composed of an ATM cell multiplexer and an ATM cell demultiplexer. In this case, the sending side of the connection between systems typically performs the demultiplexing function. The present invention relates directly to ATM cell demultiplexer (10).

FIG. 2 shows a conventional configuration of the ATM cell demultiplexer shown in FIG. 1. 2, the ATM cell demultiplexer includes an ATM cell input unit 11, an ATM cell queue write unit 12, a queue control unit 13, an ATM cell storage queue 14, and an ATM cell. The lead part 15 and the ATM cell output part 16 are comprised.

The ATM cell input unit 11 receives an ATM cell from an upper ATM functional block. The ATM cell queue write unit 12 classifies ATM cells received through the ATM cell input unit 11 for each output port and writes and stores the ATM cells in the external ATM cell storage queue 14. The ATM cell queue reading unit 15 determines the presence or absence of an ATM cell for each port of the ATM cell storage queue 14, checks whether an ATM cell can be received in a physical layer, and then checks the ATM cell from the ATM cell storage queue 14. Is read and sent to the ATM cell output unit 16. The ATM cell output unit 16 outputs the ATM cell received from the ATM cell queue reading unit 15 to the physical layer.

In the conventional ATM cell demultiplexer having such a configuration, when the ATM cell queue write unit 12 writes and stores the ATM cell in the ATM cell storage queue 14, it is previously transmitted from the ATM cell queue write unit 12. Due to congestion caused by the ATM cell, the corresponding port of the ATM cell storage queue 14 may no longer receive the ATM cell. When the congestion of the cell occurs as described above, ATM cells received thereafter are not stored in the ATM cell storage queue 14 until the congestion state is resolved.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an ATM cell traffic management apparatus using EFCI tagging and a method of managing the same, which can prevent ATM cell loss due to congestion. .

1 is a system configuration block diagram illustrating a typical asynchronous transfer mode system.

2 is a block diagram of a conventional configuration of the ATM cell demultiplexer shown in FIG. 1;

3 is a system block diagram of an apparatus for managing cell traffic using EFCI tagging according to an embodiment of the present invention;

4 is a detailed block diagram of an EFCI unit shown in FIG. 3;

FIG. 5 is a detailed block diagram illustrating the comparator shown in FIG. 4. FIG.

6 is an ATM cell structure diagram showing fields used for EFCI tagging in accordance with the present invention.

7 is a graph showing a queue depth state according to a comparison of cell count data and a threshold value with time change;

8 is a flowchart of an EFCI tagging operation performed in the EFCI unit shown in FIG. 4.

9 is a flowchart for generating a traffic feedback control signal in the queue control unit shown in FIG. 3;

FIG. 10 is a flowchart for performing traffic control according to a traffic feedback control signal in the queue control unit shown in FIG. 3.

* Description of the symbols for the main parts of the drawings *

100: ATM cell input unit 200: ATM cell queue write unit

300: queue control unit 400: ATM cell queue storage unit

500: ATM cell queue lead unit 600: EFCI unit

610: storage unit 611: cell count data storage unit

612: Threshold storage unit 613: Port information storage unit

614: queue depth state information storage unit 620: comparison unit

621: cell count comparison unit 622: queue depth comparison unit

623: EFCI tagging control 630: EFCI tagging control

700: ATM cell output unit

In the present invention for achieving this purpose, in order to prevent the loss of ATM cells due to congestion in advance, the congestion is expected to be congested in advance in the traffic source (Source) that generates the ATM cell is currently expected to be congested on the corresponding port In this case, the traffic source generating the ATM cell can reduce the amount of ATM cells, thereby eliminating cell congestion, thereby preventing ATM cell loss.

According to an aspect of an apparatus for managing cell traffic using EFCI tagging according to the present invention, in an ATM cell traffic managing apparatus, a cell threshold data and queue depth state information of an ATM cell storage queue are received to receive a preset threshold and a previously stored queue. When the cell congestion occurs in the ATM cell storage queue by comparing the depth information with the depth state information, the ATM cell output unit is performed by performing EFCI tagging indicating the occurrence of cell congestion in the ATM cell read from the ATM cell storage queue. If the EFCI tagging data is present in the EFCI unit and the ATM cell information of the other station received through the network, the ATM cell traffic reduction control information is transmitted to the other station, and the ATM cell traffic reduction control information is transmitted from the other station through the network. If received, it is configured to include a queue control unit for performing queue write reduction, interruption, port switching for ATM cell traffic reduction.

In addition, according to one aspect of the method for managing cell traffic using EFCI tagging according to the present invention, in the ATM cell traffic management method, the cell count data and queue depth state information of the ATM cell storage queue are input to receive a preset threshold and When the cell congestion occurs in the ATM cell storage queue by comparing the queue depth state information with the stored queue depth state information, an EFCI tagging indicating the occurrence of cell congestion in the ATM cell read from the ATM cell storage queue is performed. EFCI control step of transmitting through the output unit, and if there is EFCI tagging data in the ATM cell information of the other station received through the network, generating a control signal to be sent back to the other station to request to reduce the ATM cell traffic; When a control signal for reducing ATM cell traffic is received from a partner station through a network, And performing a traffic control step of performing source, stop, and port switching.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a system block diagram of an apparatus for managing cell traffic using EFCI tagging according to an embodiment of the present invention. Referring to FIG. 3, an apparatus for managing cell traffic using EFCI tagging according to an embodiment of the present invention includes an ATM cell input unit 100, an ATM cell queue write unit 200, a queue control unit 300, and an ATM cell. The storage queue 400, the ATM cell lead unit 500, the EFCI unit 600, and the ATM cell output unit 700 are configured to be included.

The ATM cell input unit 100 receives an ATM cell from an upper ATM functional block. The ATM cell queue write unit 200 classifies ATM cells received through the ATM cell input unit 100 for each output port and writes and stores the ATM cells in the external ATM cell storage queue 400. The ATM cell queue reading unit 500 determines the presence or absence of an ATM cell for each port of the ATM cell storage queue 400, checks whether an ATM cell can be received in a physical layer, and then checks the ATM cell from the ATM cell storage queue 400. Is read and sent to the EFCI unit 600. The EFCI unit 600 receives the cell count data and the queue depth information of the ATM cell storage queue 400 received from the ATM cell queue reading unit 500 to determine whether the ATM cell storage queue 400 is congested. When it is determined that congestion has occurred in the cell storage queue 400, EFCI tagging is performed on the ATM cell received from the ATM cell queue reading unit 500 and then transmitted to the ATM cell output unit 700. The ATM cell output unit 700 outputs the ATM cell received from the EFCI unit 600 to the physical layer.

4 is a detailed block diagram illustrating an EFCI unit illustrated in FIG. 3. Referring to FIG. 4, the EFCI unit stores the cell count data, the threshold value, the port information, and the queue depth state information, and the ATM cell storage queue 400 according to the information stored in the storage unit 610. Comparing unit 620 for comparing the state and EFCI tagging unit 630 for performing EFCI tagging on the ATM cell to be transmitted when congestion occurs in the ATM cell storage queue 400 according to the result of the comparison unit 620 It is configured by.

The storage unit 610 includes a cell count data storage unit 611 for storing cell count data of the ATM cell storage queue 400 and a cell count stored in the cell count data storage unit to determine whether the ATM cell storage queue is congested. A threshold storage unit 612 for storing a predetermined threshold for comparison with data, a port information storage unit 613 for storing information of a transmission port for transmitting an ATM cell, cell count data and threshold and ATM cell storage And a queue depth state information storage unit 614 for storing current queue depth state information determined by previous queue depth state information of the queue 400.

The cell count data storage 611 currently stores the number Q_Depth of the ATM cells stored in the ATM cell storage queue 400 for each corresponding port. The cell count data Q_Depth indicating the number of ATM cells currently stored in the ATM cell storage queue 400 for each corresponding port is written by the ATM cell queue writing unit 200 to write the ATM cell to the ATM cell storage queue 400 of the corresponding port. When the value is increased by +1, on the contrary, when the ATM cell queue reader 500 reads the ATM cell from the ATM cell storage queue 400 of the corresponding port, the value is decreased by -1.

The threshold storage unit 612 has two thresholds of "queue high threshold" and "queue low threshold" for each corresponding port, which can be changed by a user. "Cue high threshold" means that if the count data is more than the "cue high threshold" congestion situation, the meaning of "cue low threshold" means that the count data stored in the cell count data storage unit 611 is "cue low threshold value". "Below, it means no runaway situation. In addition, it may mean that the release from the runaway situation to the non-runaway situation.

The port information storage unit 613 is used to determine whether a transmission port for transmitting an ATM cell is normally operated. The port information storage unit 613 stores port information for indicating whether a corresponding transmission port can currently use an E1 link.

The queue depth state information storage unit 614 is a) when the cell count data is less than or equal to the "cue low threshold" (QST1), b) is greater than or equal to the "cue high threshold" (QST3), c) is greater than or equal to the "cue low threshold" and " Queue depth when it is less than the Queue High Threshold "and increases from the" Cue High Threshold "to" Cue High Threshold "(QST2), and d) decreases from" Cue High Threshold "to" Cue Low Threshold "(QST4). Indicates status information.

The comparison unit 620 reads the cell count data from the cell count data storage unit 611, reads the "cue low threshold value" and the "cue low threshold value" from the threshold storage unit 612, and the queue depth state information storage unit. The current queue depth state value QST is read from 614 and compared with each other to determine the state of the current queue as QST1, QST2, QST3, QST4.

The state value is stored in the " cudepth state information storage unit 614, and the cell count data storage unit 611 performs -1 operation. The EFCI tagging unit 630 results in the comparison unit 620. In this case, EFCI tagging is performed in the case of QST3 and QST4, and EFCI tagging is not performed in the case of QST1 and QST2.

FIG. 5 is a detailed block diagram illustrating the comparator shown in FIG. 4 and will be described in more detail with reference to FIG. 5.

The comparison unit 620 compares the cell count data read from the storage unit 610 with a threshold and determines the first queue depth state information, and the cell count comparison unit 621 determines 1. The queue depth state comparison unit 622 and the queue depth state comparison unit 622 compare the difference queue depth state information with previous queue depth state information read from the storage unit 610 to determine final queue depth state information. It is configured to include the EFCI tagging control unit 623 for generating a control signal for tagging the EFCI tagging unit 630 when congestion occurs by determining whether the congestion occurs in the ATM cell storage queue 400 according to the output result. do.

The cell count comparison unit 621 may include a first state indicating a state in which the cell count data is higher than the "cue high threshold", a second state indicating a state in which the cell count data is lower than a "cue low threshold"; A third state representing a state in which the cell count data is between the "cue low threshold" and the "cue high threshold" is output as the primary cude depth state information. Here, the first state will be QST3, the second state will be QST1, and the third state will be QST2 or QST4.

Therefore, the queue depth state comparison unit 622 outputs the QST3 state as the final queue depth state information when the primary queue depth state information is the first state, and outputs the state QST1 when the primary queue depth state information is the second state. Outputs the final queue depth status information.

On the other hand, when the first queue depth state information is the third state, if the previous queue depth state information is the QST1 or QST2 state, the QST2 state is output as the final queue depth state information, and the previous queue depth state information is In the case of the QST3 state or the QST4 state, the QST4 state is output as final queue depth state information. Here, QST3 and QST4 represent congestion states of the ATM cell storage queue.

According to the output result of the queue depth state comparison unit 622, the EFCI tagging control unit 623 performs tagging on the EFCI tagging unit 630 because congestion occurs in the ATM cell storage queue 400 in the case of QST3 and QST4. To generate a control signal.

When the EFCI tagging unit 630 receives an EFCI tagging control signal for performing EFCI tagging from the EFCI tagging control unit 623, the EFCI tagging unit 630 performs EFCI tagging on the ATM cell read from the ATM cell storage queue 400.

6 is an ATM cell structure diagram illustrating a field used for EFCI tagging according to the present invention. The structure of the ATM cell is well known and thus description thereof will be omitted. When the EFCI tagging unit 630 performs EFCI tagging on the ATM cell read from the ATM cell storage queue 400, the second bit of the "PTI" field of the ATM cell format is set to '1' as shown. Convert. When performing EFCI tagging, you can use `1` or` 0`.

When the EFCI tagging unit 630 transmits the EFCI tagging to the ATM cell data, the power device searches the PTI field of the received ATM cell, and when the EFCI tagging cell is received, transmits the traffic amount to the traffic source in the reverse direction. Send a control ATM cell called Joule. A traffic source that receives a control ATM cell that reduces the amount of traffic decreases the amount of traffic generated, resulting in a decrease in cell count data on the port, thus ending the congestion in the previous state, and thus an ATM due to a "Full" state. Cell loss can be prevented.

FIG. 7 is a graph showing a queue depth state according to a comparison of cell count data and a threshold value over time. In the graph, the queue depth refers to data stored in the cell count data storage unit 611. As described above, when the cell count data is equal to or less than the "cue low threshold" (QST1), and when equal to or greater than the "cue high threshold" (QST3), it is equal to or greater than the "cue low threshold" and is equal to or less than the "cue high threshold" and "cue low threshold". It can be represented as the case of increasing from the "cue high threshold" to (QST2), and from the "cue high threshold" to "Q low threshold" (QST4).

Therefore, a section from point a, which changes from QST2 to QST3, to point b, which changes from QST4 to QST1 in the graph, is a section for performing EFCI tagging.

8 is a flowchart illustrating an EFCI tagging operation performed by the EFCI unit 600. Referring to Figure 8, let's look at the EFCI tagging operation performed in the EFCI unit.

First, the EFCI tagging control unit 623 receives the port information and determines whether the corresponding transmission port is capable of transmitting the E1 link (S1). When the corresponding transmission port is capable of E1 link transmission, cell count data, queue data, and queue depth status information are received (S2). That is, when the ATM cell is received by the ATM cell input unit 100, the ATM cell queue write unit 200 obtains cell count data from the cell count data storage unit 611. At this time, if the obtained cell count data is in a "Full" state, the ATM cell is lost in the ATM cell storage queue 400 and is lost. However, if the cell count data is not "Full", the cell count data is stored in the ATM cell storage queue 400, and the cell count data storage unit 611 writes the obtained cell count data to +1. The cell count data storage unit 611 stores the cell count data so written.

The cell count comparison unit 621 reads the cell count data of the ATM cell storage queue 400 stored in the cell count data storage unit 611, compares the threshold values set in the threshold storage unit 612, and compares them with the primary queue. Depth state information is determined (S3).

The primary queue depth state information includes a first state indicating a state when the cell count data is larger than the "cue high threshold", a second state indicating a state when the cell count data is smaller than a "cue low threshold", and a cell. A third state representing the state in which the count data is between the " cue low threshold " and " cue high threshold "

When the primary queue depth state information is determined as described above, the queue depth state comparison unit 622 determines the previous queue depth state information and the previous queue cell storage queue stored in the queue depth state information storage unit 614. The final depth information is determined by comparing the depth information (S5).

That is, if the first queue depth state information is the first state, the QST3 state is output as the final queue depth state information. If the first queue depth state information is the second state, the QST1 state is output as the final queue depth state information. . On the other hand, when the first queue depth state information is the third state, when the previous queue depth state information is the QST1 or QST2 state, the QST2 state is output as the final queue depth state information, and the previous queue depth state information is In the case of the QST3 state or the QST4 state, the QST4 state is output as final queue depth state information. Here, QST3 and QST4 represent congestion states of the ATM cell storage queue.

The EFCI tagging controller 623 determines whether or not the cell is congested according to the output result of the queue depth state comparator 622 (S6). That is, in the case of QST3 and QST4, since congestion occurs in the ATM cell storage queue, a control signal for tagging the EFCI tagging unit 630 is generated.

The EFCI tagging unit 630 performs EFCI tagging on the ATM cell read from the ATM cell storage queue 400 according to the EFCI tagging control signal generated from the EFCI tagging control unit 623 (S7). The cue data is transmitted through 700.

That is, when the ATM cell is read from the ATM cell storage queue 400 and the ATM cell is in QST3 and QST4 states, the second bit of the "PTI" field of the cell format is converted to '1' for the ATM cell to be read. Send to the power device.

9 is a flowchart of generating a traffic feedback control signal in the queue control unit 300 illustrated in FIG. 3. Referring to FIG. 9, a flow of generating a traffic feedback control signal in the queue control unit 300 will be described.

When receiving the ATM cell from the large station (S11), the queue controller 300 searches the PTI field of the received ATM cell to determine whether there is EFCI tagging information (S12). If there is EFCI tagging information in the PTI field of the ATM cell, it transmits by feeding back traffic reduction control information for reducing the amount of traffic to a large station that has transmitted traffic in the reverse direction (S13). In this way, the large station receiving the traffic reduction control information reduces the traffic generation of the corresponding port, and as a result, the cell count data of the corresponding port is reduced, thereby preventing ATM cell loss due to the "Full" state.

FIG. 10 is a flowchart of controlling traffic according to a traffic feedback control signal in the queue controller shown in FIG. 3. Referring to FIG. 10, an operation of controlling traffic according to the traffic feedback control signal in the queue control unit 300 will be described.

When the queue control unit 300 receives a feedback signal for traffic control from a power station (S21), it determines whether the received feedback signal is a traffic reduction control signal (S22). If the traffic reduction control signal, queue write reduction, interruption, and port switching for traffic reduction are performed (S23). The decrease, interruption, and port switching of the queue light reduce the queue light when the traffic congestion amount is small according to the state of the traffic reduction control signal, and stop and switch the port when the congestion amount is large.

According to the present invention, an ATM Switching System monitors the transmission bandwidth of ATM cells transmitted and received to each input / output port, detects excessive ATM cell inflow (congestion) in advance, and informs the large station. By controlling the traffic volume according to the control signal, it is possible to provide an effect of preventing the loss of ATM cells due to congestion.

Claims (15)

In the ATM cell traffic management apparatus, When the cell congestion occurs in the ATM cell storage queue by receiving the cell count data and the queue depth state information of the ATM cell storage queue, and determining the queue depth state information by comparing the preset threshold value and the previously stored queue depth state information. An EFCI unit for performing an EFCI tagging indicating an occurrence of cell congestion to an ATM cell read from the ATM cell storage queue and transmitting the cell through an ATM cell output unit; a) when the EFCI tagging data exists in the ATM cell information of the other station received through the network, transmits ATM cell traffic reduction control information to the other station; b) ATM cell traffic management apparatus using EFCI tagging comprising a queue control unit for performing queue write reduction, interruption, and port switching to reduce ATM cell traffic when ATM cell traffic reduction control information is received from a partner station through a network. The method of claim 1, wherein the EFCI unit, A storage unit which stores cell count data, threshold value, port information, and queue depth state information; The primary queue depth state information is determined by comparing the cell count data read from the storage unit with a threshold value, and the final queue depth is compared by comparing the primary queue depth state information with the previous queue depth state information read from the storage unit. A comparator for determining status information and comparing statuses of the ATM cell storage queues; ATM cell traffic management apparatus using EFCI tagging including an EFCI tagging unit for performing EFCI tagging to indicate that congestion occurs in an ATM cell to be transmitted when congestion occurs in an ATM cell storage queue according to the result of the comparing unit The method of claim 2, wherein the storage unit, A cell count data storage unit for storing cell count data of an input ATM cell storage queue; A threshold storage unit for storing a predetermined threshold for comparing with cell count data stored in the cell count data storage unit to determine whether the ATM cell storage queue is congested; A storage unit for storing port information for determining whether a transmission port for transmitting an ATM cell is normally operated; An apparatus for managing ATM cell traffic using EFCI tagging, comprising: a queue depth state information storage unit configured to store the cell count data and the threshold value and current queue depth state information determined by previous queue depth state information of the ATM cell storage queue. The method of claim 3, wherein the threshold value stored in the threshold storage unit, A first threshold value that is a threshold for determining that congestion has occurred in an ATM cell storage queue when the ATM cell count data is greater than or equal to a reference value; ATM cell traffic management using EFCI tagging including a second threshold for releasing the set congestion generation setting when the ATM cell count data is less than a reference value when it is determined that congestion has occurred in the ATM cell storage queue. Device. The depth of the queue depth information stored in the queue depth state information storage unit, A first state in which the cell count data is greater than the first threshold and indicates a congestion state; A second state in which the cell count data is less than a second threshold and indicates a non-congestion state; The cell count data is between the first threshold value and the second threshold value, the third A state indicating a non-congestion state, ATM cell traffic management apparatus using EFCI tagging, wherein the cell count data is between a first threshold and a second threshold, and includes a third B state indicating a congestion state. (1st threshold> 2nd threshold) The method of claim 2, wherein the comparison unit, A first comparison unit which compares the cell count data read from the storage unit with a threshold and determines primary queue depth state information; A second comparator for determining final queue depth state information by comparing first queue depth state information determined by the first comparator with previous queue depth state information read from the storage unit; ATM using EFCI tagging, including a tagging control unit for generating a control signal for tagging the EFCI tagging unit when congestion occurs by determining whether congestion occurs in an ATM cell storage queue according to the output result of the second comparator. Cell traffic management device. The method of claim 6, The first comparison unit, A first state indicating a state when the cell count data is larger than a first threshold value, a second state indicating a state when the cell count data is smaller than a second threshold value, and the cell count data having a first threshold value and a first threshold value. Outputting the third state indicating the state between the two thresholds as the first queue depth state information, The second comparison unit, a) when the first queue depth state information is the third state, and when the previous queue depth state information is the second or 3A state, the 3A state is output as the final queue depth state information, and the previous queue depth state If the information is the first state or the third state B, the state 3B is output as final queue depth state information. b) if the first queue depth state information is the first state, output the first state as final queue depth state information; and if the first queue depth state information is the second state, the second state is final queue depth state information. Output to, c) ATM cell traffic management apparatus using EFCI tagging to determine the first state and the third state B as congestion states of the ATM cell storage queue. (1st threshold> 2nd threshold) The method of claim 2, wherein in the EFCI tagging unit, the EFCI tagging, ATM cell traffic management apparatus using EFCI tagging that performs EFCI tagging on the second bit of the PTI field of an ATM cell. In the ATM cell traffic management method, When the cell congestion occurs in the ATM cell storage queue by receiving the cell count data and the queue depth state information of the ATM cell storage queue, and determining the queue depth state information by comparing the preset threshold value and the previously stored queue depth state information. An EFCI control step of performing an EFCI tagging indicating an occurrence of cell congestion to an ATM cell read from the ATM cell storage queue and transmitting the cell through an ATM cell output unit; When the EFCI tagging data is present in the ATM cell information of the counterpart station received through the network, generating a control signal to be transmitted by feeding back to the counterpart station to request the reduction of ATM cell traffic; Method of ATM cell traffic management using EFCI tagging that performs traffic control step of reducing, stopping, and port switching to reduce ATM cell traffic when receiving control signal for reducing ATM cell traffic through network . The method of claim 9, wherein the EFCI control step, The primary queue depth state information is determined by comparing the cell count data of the ATM cell storage queue with a predetermined threshold value, and the primary queue depth state information is compared with the previous queue depth state information of the ATM cell storage queue. Determining the state of the ATM cell storage queue by determining final queue depth state information; A method for managing ATM cell traffic using EFCI tagging, comprising performing EFCI tagging to indicate that congestion has occurred in an ATM cell to be transmitted when congestion occurs in an ATM cell storage queue according to the result of the final queue depth state information. . The method of claim 9, wherein the threshold value, A first threshold value that is a threshold for determining that congestion has occurred in an ATM cell storage queue when the ATM cell count data is greater than or equal to a reference value; ATM cell traffic management using EFCI tagging including a second threshold for releasing the set congestion generation setting when the ATM cell count data is less than a reference value when it is determined that congestion has occurred in the ATM cell storage queue. Way. 10. The method of claim 9, wherein the queue depth state information, A first state in which the cell count data is greater than the first threshold and indicates a congestion state; A second state in which the cell count data is less than a second threshold and indicates a non-congestion state; A third A state in which the cell count data is between the first threshold value and the second threshold value, wherein the cell count data indicates a non-congestion state; And the cell count data is between the first threshold value and the second threshold value, and includes a third B state indicating a congestion state. (1st threshold> 2nd threshold) 10. The method of claim 9, wherein determining the state of the ATM cell storage queue comprises: Determining first queue depth state information by comparing the cell count data of the ATM cell storage queue with the threshold value; Comparing the determined first queue depth state information with previous queue depth state information for the ATM cell storage queue to determine final queue depth state information; A method for managing ATM cell traffic using EFCI tagging comprising generating a control signal for performing EFCI tagging when congestion occurs by determining whether congestion occurs in an ATM cell storage queue according to the result of the final queue depth state information. . The method of claim 13, In the determining of the first queue depth state information, A first state indicating a state when the cell count data is larger than a first threshold value, a second state indicating a state when the cell count data is smaller than a second threshold value, and the cell count data having a first threshold value and a first threshold value. Outputting the third state indicating the state between the two thresholds as the first queue depth state information, In the determining of the final queue depth state information, a) when the first queue depth state information is the third state, and when the previous queue depth state information is the second or 3A state, the 3A state is output as the final queue depth state information, and the previous queue depth state If the information is the first state or the third state B, the state 3B is output as final queue depth state information. b) if the first queue depth state information is the first state, output the first state as final queue depth state information; and if the first queue depth state information is the second state, the second state is final queue depth state information. Output to, c) A method for managing ATM cell traffic using EFCI tagging, wherein the first state and the third state B are determined to be congested states of the ATM cell storage queue. (1st threshold> 2nd threshold) The method of claim 10, wherein in performing the EFCI tagging, The EFCI tagging is an ATM cell traffic management method using EFCI tagging, which performs EFCI tagging on the second bit of the PTI field of an ATM cell.