KR100318945B1 - Traffic controller in asynchronous transfer mode switchboard - Google Patents

Abstract

The technical field to which the invention described in the claims belongs.

A traffic control device in an asynchronous transfer mode exchange.

B. Technical problem to be solved

An apparatus for controlling traffic in a subscriber board of an asynchronous transfer mode exchange is provided.

C. Summary of the Solution

The present invention relates to a traffic control device in a subscriber board of an asynchronous transmission mode switch, wherein a cell congestion occurrence and cell congestion status information are output by recognizing a congestion occurrence of a cell input from a subscriber module of the asynchronous transmission mode switch to a switch module. A cell congestion processing unit for outputting cell congestion control unit and cell data control information for controlling input of a cell inputted to the subscriber module when receiving the cell congestion generation and cell congestion state information outputted from the cell congestion recognition unit; And a cell traffic controller configured to control a cell inputted to the subscriber module not to be inputted to the switch module when the control information from the cell congestion processing unit is received.

D. Significant Uses of the Invention

It is used for traffic control in subscriber board of asynchronous transfer mode switch.

Description

Traffic Controller in Asynchronous Transfer Mode Switching Subscriber Board

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a traffic coordination apparatus of an Asynchronous Transfer Mode (hereinafter referred to as "ATM") exchange, and more particularly, to an apparatus for coordinating traffic generated at a subscriber board of an ATM exchange. .

Typically, in an ATM switch, when ATM cell data is input to a subscriber module, the input ATM cell data is sent to a switch module. Then, the switch module accepts the service input through the subscriber module from the multiple subscribers and sends it to the connected location of each subscriber.

1 is a block diagram showing a conventional ATM switch. Referring to FIG. 1, the ATM switch includes a plurality of subscriber modules 102, 104, 106, 108, 110, 112, a switch module 100, a higher software block 114, and the like. Hereinafter, referring to the cell data processing operation of the subscriber module 102, when an ATM cell is input from the subscriber through the subscriber module 102, the cell is combined with an IPC (Inter Processor Communication) cell created in the subscriber module 102. It is input to the switch module 100 through the line 116. The switch module 100 separates the cell data input from the subscriber module 102 into an ATM cell and an IPC cell, and transmits the cell data to the counterpart subscriber module 108 through the line 118 when the ATM cell is input. In addition, when the IPC cell is input, the switch module 100 processes the IPC cell if it is an IPC cell to be processed. Otherwise, the switch module 100 transmits the IPC cell to the upper software block 114. Then, the upper software block 114 analyzes the IPC cell and if there is information to be transmitted to the subscriber module 102 or the switch module 100, the IPC cell is used again to the subscriber module 102 or the switch module 100 using the IPC cell. send.

However, the switch module of the conventional ATM switch concentrates on any one port of the subscriber module and performs a task of discarding the congested ATM cell data when cell data is received and congestion occurs, and when congestion continues. Since the switch module has to continuously discard ATM cell data, it takes a lot of load, causing problems such as loss of cell data and delay in processing speed.

As described above, the switch module of the conventional ATM switch concentrates on any one port of the subscriber module and performs a task of discarding the congested ATM cell data when cell data is received and congestion occurs, and when congestion continues. Since the switch module has to continuously discard ATM cell data, it takes a lot of load, causing problems such as loss of cell data and delay in processing speed.

Accordingly, an object of the present invention is to provide an apparatus for controlling traffic in a subscriber board which prevents overload in a switch module due to congestion of ATM cell data.

1 is a schematic block diagram of a conventional ATM switch;

2 is a block diagram of an ATM switch equipped with a traffic control device according to an embodiment of the present invention;

3 is an IPC cell format diagram according to an embodiment of the present invention.

4 is a traffic control flowchart according to an embodiment of the present invention.

According to the present invention for achieving the above object, in a traffic control device in a subscriber board of an ATM switch, it recognizes the occurrence of cell congestion inputted from the subscriber module of the ATM switch to the switch module and detects cell congestion and cell congestion state information. A cell congestion processing unit for outputting cell congestion processing unit and cell congestion processing unit for outputting cell data control information for controlling input of a cell inputted to the subscriber module when receiving cell congestion generation and cell congestion state information outputted from the cell congestion recognition unit And a cell traffic controller configured to control a cell inputted to the subscriber module not to be inputted to the switch module when the control information from the cell congestion processing unit is received.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a block diagram of an ATM exchanger equipped with a traffic conditioner according to an embodiment of the present invention. 2, the subscriber module 204, 206 according to an embodiment of the present invention is newly configured with a cell traffic control unit (212, 214) in the conventional subscriber module. In addition, the switch module 200 includes a cell congestion recognizer 208 in the conventional switch module, and the upper software block 202 includes a cell congestion processor 210. The cell congestion recognizer 208 loads the congestion state in the IPC cell and transmits the congestion state to the upper software block 202. The cell congestion processing unit 210 analyzes an IPC cell transmitted from the switch module 200 including cell congestion occurrence and cell congestion state information and transmits the cell congestion occurrence and cell congestion state information back to the subscriber module 204. To send using IPC cell. The cell traffic control unit 212 analyzes the IPC cell transmitted and received from the upper software block 202 to determine the cell congestion state, and when the cell traffic congestion state is determined, inputs the cell data input from the subscriber to the switch module 200. To control traffic.

3 illustrates a format of an IPC cell transmitted and received between the cell congestion processing unit, the cell congestion recognition unit, and the cell traffic control unit according to an embodiment of the present invention. Referring to FIG. 3, an IPC according to an embodiment of the present invention is described. In the cell format, cell congestion generation and cell congestion status information are displayed on the Sig_id and dummy region for cell congestion control so that the subscriber module or the upper software block can be known through the IPC cell including the information.

FIG. 4 is a flowchart illustrating an operation control in a cell congestion recognition unit of a switch module for adjusting traffic occurrence due to congestion of cell data input to the switch module according to an exemplary embodiment of the present invention. Hereinafter, an operation of controlling cell congestion in the ATM switcher subscriber board will be described in detail with reference to FIGS. 2, 3, and 4.

First, the cell congestion recognition unit 208 included in the switch module 200 measures the cell rate of cell data input from the subscriber module 204 in step 400. In step 402, the cell congestion recognizing unit 208 checks the cell rate of the currently input cell data measured in step 400 to determine whether the input cell data reaches the cell congestion state. In this case, if it is recognized that the input cell rate of the cell data inputted to the switch module 200 through the subscriber module 204 reaches the cell congestion state, the cell congestion recognition unit 208 proceeds to step 404 and FIG. 3. Cell congestion occurrence and cell congestion state information are recorded in the sig_id and dummy region of the IPC cell format. In step 406, the cell congestion recognizing unit 208 transmits the IPC cell data in which the cell congestion occurrence and the cell congestion state information are recorded to the cell congestion processing unit 210 of the upper software block 202. Then, the cell congestion processing unit 210 of the upper software block 202 analyzes the IPC cell data including the cell congestion occurrence and cell congestion status information transmitted from the cell congestion recognition unit 208 of the switch module 200 and the subscriber module. Recognizing that cell congestion is occurring in the switch module 200 by the cell data input from the 204, and using the IPC cell control information for controlling the cell data input to the subscriber module 204 using the cell congestion Transfer back to recognition unit 208. In response, the cell congestion recognition unit 208 proceeds from step 408 to step 410 in response to the IPC cell in which the cell data control information received from the cell congestion processing unit 210 is recorded. Transmit to cell traffic control unit 212. Accordingly, the cell traffic control unit 212 of the subscriber module 204 is congested by the cell data currently input by the cell data control information included in the IPC cell transmitted from the cell congestion processing unit 210 of the upper software block 202. Recognizing that the state, and by controlling the input of the cell data input to the switch module 200 through the subscriber module 204 to prevent traffic generation due to cell congestion in the switch module 200.

As described above, the present invention has an advantage of preventing overloading of the switch module due to cell congestion by recognizing cell congestion in the subscriber module of the ATM switch and controlling traffic of the cell data inputted from the subscriber to the switch module in advance in the subscriber module. .

Claims (1)

A traffic conditioner in a subscriber board of an asynchronous transfer mode switch, Recognizing the occurrence of cell congestion input from the subscriber module of the asynchronous transfer mode switch to the switch module, the cell congestion occurrence and cell congestion status information is loaded in a predetermined area of the IPC cell format and output. A cell congestion recognition unit, A cell congestion processing unit for outputting cell data control information for controlling a cell input to the subscriber module when receiving cell congestion generation and cell congestion state information output from the cell congestion recognizing unit; And a cell traffic controller configured to control a cell inputted to the subscriber module not to be inputted to the switch module when the control information from the cell congestion processing unit is applied.