KR19990051059A - Parallel ATM traffic measurement / control device and method thereof - Google Patents

Abstract

In the present invention, parallel ATM traffic measurement for detecting and controlling a cell exceeding a negotiated traffic rate for each virtual connection with respect to traffic input to an Asynchronous Transfer Mode (ATM) network A control device and a method thereof, comprising: connecting two negotiation violation detectors for detecting a cell exceeding a negotiated traffic rate in parallel, and determining whether there is a negotiation violation determined by each negotiation violation detection unit and a cell loss priority A parallel ATM traffic measurement / control device and method for determining whether to discard, tag, or pass a cell according to a combination of Cell Loss Priority and negotiation violation result, without adding much hardware logic, A variety of increasing ATM functions are performed within one cell time, and the time required to minimize traffic control functions is minimized. It is effective to guarantee better QOS for various kinds of service traffic.

Description

Parallel ATM traffic measurement / control device and method thereof

In the present invention, parallel ATM traffic measurement for detecting and controlling a cell exceeding a negotiated traffic rate for each virtual connection with respect to traffic input to an Asynchronous Transfer Mode (ATM) network / Control device and method thereof.

The ATM scheme can be usefully accommodated at various data rates because the information transfer capacity is allocated on a cell basis according to a user's request, and means for providing economical information transfer by transmitting traffic having a variable bit rate through statistical multiplexing. It is becoming. However, due to unpredictable traffic characteristics, excessive cell delay and congestion can be caused, and thus cell loss can occur, so proper traffic control is required to ensure the required quality of service. In addition, with the development of ATM technology, accurate control of various traffic parameters such as PCR (Peak Cell Rate), CDV (Cell Delay Variation), SCR (Sustainable Cell Rate), and BT (Burst Tolerance) is required. 'S single traffic control unit is unable to control them simultaneously. Therefore, conventionally, this problem has been solved by connecting traffic control devices in series and processing each traffic parameter in each stage. However, the conventional traffic control device has a problem that it is difficult to perform all of these functions within one cell time due to an increase in traffic handling as well as other functions to be processed in the ATM device.

In order to solve the above problems, the present invention, in order to minimize the time to perform the traffic control function to perform all the various ATM functions within one cell time, compared to the conventional traffic control device without adding more hardware logic, traffic in parallel A parallel ATM traffic measurement / control device and a method for configuring a control device and processing negotiation violation cells according to a combination of negotiation violation determination states and a method thereof can be performed to perform various increasing ATM functions within one cell time. The goal is to ensure better quality of service (QOS) for a variety of emerging service traffic by minimizing the traffic control function execution time.

1 is a block diagram of a parallel ATM traffic measurement and control device;

2 is a flow chart of the measurement and control process of FIG. 1;

<Explanation of symbols for main parts of drawing>

10: traffic measurement / control device 11: cell receiving unit

12: lookup table inspection unit 13: buffer

14: parameter read / write control unit 15a, 15b: negotiation violation detection unit

16: violation cell processing determination unit 17: violation cell processing unit

In the present invention, parallel ATM traffic measurement for detecting and controlling a cell exceeding a negotiated traffic rate for each virtual connection with respect to traffic input to an Asynchronous Transfer Mode (ATM) network / Control apparatus and method thereof, in particular, connecting two negotiation violation detectors for detecting cells exceeding the negotiated traffic rate in parallel, negotiating violations and cell loss determined by each negotiation violation detection unit A device for determining whether to discard, tag, or pass a cell according to a combination of Cell Loss Priority and negotiation violation result.

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

1 is a block diagram of an apparatus for measuring and controlling parallel ATM traffic, including a cell receiver 11 for checking whether a cell is received and extracting header information S2 from a receiver cell S1, and a traffic parameter corresponding to the received cell. A lookup table checker 12 looking for a stored lookup table address, a buffer 13 for storing a cell received from the cell receiver 11 while detecting a negotiation violation and determining processing of a violation cell, and a cell receiving A parameter read / write control unit 14 which reads parameter values from the lookup table when it is updated and updates parameter values in the lookup table when the negotiation violation detection is completed, and a negotiation violation detection unit which detects a cell exceeding the negotiated traffic rate ( 15a, 15b and the violation cell processing determining unit 1 for determining whether to discard, tag, or pass the cell according to a combination of the states determined by the negotiation violation detection units 15a and 15b. 6) and a violation cell processing unit 17 for controlling discarding and tagging as a measure for negotiation violation.

The operation of the parallel ATM traffic measurement and control device 10 configured as described above is as follows.

When the cell receiver 11 checks whether the cell is received and extracts the header information S2 from the receiver cell S1 and outputs the header information S2 to the lookup table inspector 12, the lookup table inspector 12 receives traffic corresponding to the received cell. The area storing the parameter is found in the lookup table, and the address S3 is output to the parameter read / write control unit 14. The parameter read / write controller 14 generates a memory access signal S11 to the outside by using the address S3 received from the lookup table inspector 12 and through this, the traffic parameter A (S4) of the corresponding area of the address S3. ) And B (S5). The negotiation violation detection unit 15a or 15b checks whether the traffic rate negotiated with each of the parameters A (S4) and B (S5) for the same receiving cell S1 in the parameter read / write control unit 14 is exceeded. That is, the negotiation violation detection unit 15a for the parameter A checks whether the traffic rate negotiated using the parameter A (S4) with respect to the reception cell S1 is exceeded, and the negotiation violation detection unit 15b for the parameter B is received. The cell S1 is checked whether the negotiated traffic rate is exceeded using the parameter B (S5). The violation cell processing determination unit 16 inputs an A violation or A compliance (S6) signal and a B violation or B compliance (S7) signal as a test result detected by the negotiation violation detection units 15a and 15b. The combination determines whether to discard or tag the cell as an action for negotiating a violation, and transmits this signal (S8) to the violating cell processing unit 17 and at the same time the arrival time of the currently received cell read from the internal timer (S9). ) Is output to the parameter read / write control unit 14 and stored in the lookup table for use by the negotiation violation detection units 15a and 15b when the next cell arrives.

Truth table for decision of dealing with violation cell. S6 S7 S8 CLP = 0 cell, violation CLP = 0 cell, violation Disposal CLP = 0 cell, violation CLP = 0 cell, compliant tag CLP = 1 cell, violation CLP = 1 cell, violation Disposal CLP = 1 cell, violation CLP = 1 cell, compliant Pass CLP = 0 cell, compliant CLP = 0 cell, violation Pass CLP = 0 cell, compliant CLP = 0 cell, compliant Pass CLP = 1 cell, compliant CLP = 1 cell, violation Disposal CLP = 1 cell, compliant CLP = 1 cell, compliant Pass

The buffer 13 stores the cell received from the cell receiver 11 while detecting a violation of the negotiation and determining the violation cell processing, and the violation cell processing unit 17 outputs a signal output from the violation cell processing determination unit 16. The cell S2 is actually discarded, tagged, or passed through while reading the cell S2 from the buffer 13 by using S8 to output the cell S10 that is not finally discarded.

2 is a flow chart of the measurement and control process of FIG.

First, the cell receiver 11 determines whether the reception cell S1 has arrived or not. If not, the cell receiver 11 returns to determine whether or not the cell has arrived (21). If it is determined that the test is not performed, the flow returns to the step 21 (22), and if it is checked, the timer value and the parameters A and B are read (23). Then, the negotiation violation for the parameter A read in the step 23 is determined (24), and whether the determination result of the step 24 is a violation (25), in case of violation, the cell loss priority ( CLP) determines whether it is '0' (26), and if it is not a violation (i.e., compliance), determines whether the cell loss priority (CLP) is '0' (27).

Further, at the same time as performing the step 24, a negotiation violation for the parameter B read in the step 23 is determined (28), and whether the determination result of the step 28 is a violation is determined (29). In case of a violation, it is determined whether the cell loss priority (CLP) is '0' (30). If not, it is determined whether the cell loss priority (CLP) is '0' (31). .

Next, the determination results of the steps 26, 27, 30, and 31 are combined to determine discarding, tagging, or passing for the violating cell and to process 32 for the violating cell. When the step 32 is completed, the parameter A and the parameter B are updated (33).

According to the present invention, two negotiation violation detection units for detecting cells exceeding a negotiated traffic rate are connected in parallel, and whether or not negotiation violations determined by respective negotiation violation detection units, cell loss priority, and negotiation are performed. Provides a parallel ATM traffic measurement / control device and method for determining whether to discard, tag, or pass a cell according to a combination of violation results, thereby increasing the variety of ATM functions that are being added without adding much hardware logic. By performing all within one cell time and minimizing the execution time of the traffic control function, it is possible to guarantee better QOS for various kinds of service traffic emerging.

Claims (3)

A traffic measurement / control apparatus for detecting and controlling a cell exceeding a negotiated traffic rate for each virtual connection for traffic input to an ATM network, A cell receiver 11 for checking whether a cell is received and extracting header information from a receiver cell; A lookup table checker (12) for finding a lookup table address storing a traffic parameter corresponding to a cell received by the cell receiver (11); A buffer (13) for storing a cell received from the cell receiver (11) while detecting a negotiation violation and determining processing of a violation cell; A parameter read / write control unit 14 which reads parameter values from the lookup table when the cell is received and updates parameter values in the lookup table when negotiation violation detection is completed; Negotiation violation detection units (15a, 15b) for detecting cells exceeding the negotiated traffic rate; In the negotiation violation detection units 15a and 15b, A violation cell processing determining unit 16 that determines whether to discard, tag, or pass the cell according to the determined combination of states; Parallel cell A characterized in that it comprises a violating cell processing unit 17 that actually discards, tags, or passes the cell while reading the cell from the buffer 13 by the signal output from the violating cell processing determining unit 16. TEM traffic measurement / control device. A traffic measurement / control method for detecting and controlling a cell exceeding a negotiated traffic rate for each virtual connection for traffic input to an ATM network, A first step of determining whether or not the receiving cell S1 has arrived by the cell receiving unit 11, and if not, returns to the cell reception unit to determine whether or not the cell arrives again; A second step of determining whether a lookup table is checked if a cell arrives, and returning to the first step if not checking; A third step of reading a timer value and parameters A and B in case of checking; A fourth step of determining a negotiation violation for the parameter A read in the third step; A fifth step of determining whether the determination result of the fourth step is a violation or not; A sixth step of determining whether the cell loss priority (CLP) is '0' in case of a violation in the fifth step; A seventh step of determining whether the cell loss priority (CLP) is '0' if the violation is not a violation in the fifth step; An eighth step of judging a negotiation violation for the parameter B read in the third step simultaneously with performing the fourth step; A ninth step of determining whether the determination result of the eighth step is a violation; A tenth step of determining whether a cell loss priority (CLP) is '0' in case of a violation in the ninth step; An eleventh step of determining whether the cell loss priority (CLP) is '0' if the violation is not a violation in the ninth step; A twelfth step of combining discarding results of the sixth, seventh, tenth, and eleventh steps to determine discarding, tagging, or passing of the violating cell and to process the violating cell; And a thirteenth step of updating parameters A and B when the twelfth step is completed. The method of claim 2, In the twelfth step, if the negotiation for parameters A and B is a violation and the cell loss priority is '0' or '1', or the negotiation for parameter A is compliant and the negotiation for parameter B is a violation and cell loss A first substep of discarding the violating cell when the priority is '1'; A second substep of tagging a violating cell if the negotiation on parameter A is a violation, the negotiation on parameter B is compliant and the cell loss priority is '0'; Negotiation for parameters A and B is compliant and cell loss priority is '0' or '1', or negotiations for parameters A and B are in different states and cell loss priority is '0' or '1' And a third substep of passing the violating cell in one case.