KR0175571B1 - How to Create a Forward Performance Monitoring Operation and Maintenance Cell - Google Patents

Abstract

The present invention relates to a forward performance sensing (OAM) cell generation method in an asynchronous transfer mode (ATM) layer. In the asynchronous transfer mode transmission scheme, a virtual path identifier (VPI) A virtual connection type network in which a transmission path is determined by an identifier (VCI) is configured. An operation and maintenance (OAM) function of an asynchronous transmission mode layer is provided to operate and maintain the virtual connection of the asynchronous transfer mode layer And the operation and maintenance process of the asynchronous transfer mode layer is performed using the operation and maintenance cell having the information related to the virtual connection and the forward performance detection operation and maintenance cell and the reverse performance Monitoring operation and maintenance cells are used. For performance monitoring, first, operation and maintenance cells are used to transmit / When a cell having a block size that is already defined in the transmitting side is transmitted in the calculation of the number of cells and the block error detection code for each user cell, the number of transmitted cells and the calculation result of the block error detection code of the cell, If the forward performance monitoring operation and maintenance cell is input at the receiving side, the result of the comparison with the forward performance monitoring operation and maintenance cell information at the receiving side is sent to the operation and maintenance cell at the transmitting side. At this time, And a maintenance cell is referred to as a reverse performance monitoring operation and maintenance cell. The present invention provides a forward performance monitoring operation and a maintenance cell generation control method performed when a transmitter transmits a user cell having a set block size.

Description

How to Create a Forward Performance Monitoring Operation and Maintenance Cell

In the conventional forward performance monitoring operation and maintenance (OAM) cell generation, the performance monitoring for the cell buffer and the user cell for the user cell transferred from the switch to the physical layer, and the forward performance monitoring operation and maintenance cell And a method of transmitting the cells selectively to the two buffers in the physical layer.

In the above method, two problems arise. One of the problems is that when a cell is transferred to the physical layer by taking a priority in the user cell buffer, the user cell is input from the switch and transmitted to the physical layer to perform performance monitoring, When the user cells of the block size set for the connection for which the monitoring is activated are transmitted, the forward performance monitoring operation and maintenance cell is generated and the forward performance monitoring operation and maintenance cell is transmitted to the physical layer after the last user cell of the block .

However, the priority of the user cell buffer may be missed.

As a second problem, in the opposite case, when the forward performance monitoring operation and maintenance cell buffer is prioritized, the priority of the last user cell of the corresponding block is pushed before the user cell in the corresponding block is waiting in the buffer Forward power monitoring and maintenance cells can be delivered to the physical layer first.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method for generating a forward performance monitoring operation and maintenance cell without interfering with user cell flow using the proposed structure and flow.

FIG. 1 is an asynchronous transfer mode (ATM) subscriber hardware configuration diagram applied to the present invention; FIG.

Figure 2 is a block diagram of the forward performance monitoring and maintenance (OAM) cell generation of the present invention.

FIG. 3 is a block diagram of an asynchronous transfer mode (ATM) layer transmitter performance monitoring information table according to the present invention; FIG.

FIG. 4 is a flowchart of forward performance monitoring operation and maintenance (OAM) cell generation according to the present invention. FIG.

FIG. 5 is a block diagram of a forward performance monitoring and maintenance (OAM) cell according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: physical layer processing unit 2: asynchronous transfer mode layer processing unit

3: control unit 4: cell reception unit

5: Performance monitoring part 6: Connection identifier storage First in first out (FIFO)

7: Forward Performance Monitoring Operation & Maintenance (OAM)

8: Performance monitoring information table 9: Physical layer transmission section

The present invention relates to a method for generating forward operation and maintenance (OAM) cells in an asynchronous transfer mode (ATM) layer.

FIG. 1 is a diagram illustrating an asynchronous transfer mode hardware configuration applied to the present invention. The asynchronous transfer mode switch subscriber matching module includes a physical layer processing unit 1 terminating an STM-1 interface, an asynchronous transfer mode A processing unit 2, and a control unit 3 for controlling the physical layer and the asynchronous transfer mode layer processing unit.

The present invention is located in the transmission operation and maintenance processing section in the asynchronous transmission mode layer processing section (2).

The present invention also relates to performance monitoring during operation and maintenance processing in the asynchronous transfer mode layer processing unit 2. The performance monitoring is performed for a forward performance monitoring operation and maintenance cell after a user cell transmission of a block set for an arbitrary connection for which performance monitoring is activated And a method for generating the same.

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

Figure 2 is a block diagram of the forward performance monitoring operation and maintenance cell generation of the present invention.

A cell reception unit 4 for receiving an internal format cell 11 and a cell connection identifier 12 from an asynchronous transfer mode (ATM) switch, a performance monitoring unit for monitoring the performance of a cell transmitted from the switch to the physical layer, (5), a performance monitoring information table (9) management unit for storing performance monitoring information, and a forward performance monitoring operation and maintenance (OAM) cell when a user cell having a block size set for a connection for which performance monitoring is activated is transmitted. (FIFO) unit 6 for generating a connection identifier for generating the connection identifier.

There is a physical layer transmission unit 9 for transferring cells to the physical layer. When a cell is transferred from a switch to a physical layer of a user cell of a block size set for a connection for which performance monitoring is enabled using the above-mentioned respective units, And a generation unit 7 for generating an economical forward performance monitoring operation and maintenance cell.

The cell receiving unit 4 receives a connection identifier 12 obtained from a cell in the form of an internal cell 11 and a virtual path identifier / virtual channel identifier (VPI / VCI) of the cell from the outside.

The inner cell 11 is a cell type used in the asynchronous transfer mode exchanger, and the connection identifier 12 is a connection unique number in which the connection is activated at the current network node.

Also, the size of the connection identifier 12 depends on the maximum number of connections supported by the system.

The changed asynchronous transmission mode cell 17, the cell synchronization number 16, the connection identifier 14 and the transmission cell existence notification signal 15 ).

The performance monitoring unit 5 monitors the asynchronous transmission mode cell 17, the cell synchronization signal 16, the connection identifier 14 and the transmission cell existence notification signal 15 output from the cell reception unit 4 And receives it from the cell reception unit 4.

If there is an asynchronous transfer mode cell 17 transmitted from the switch to the physical layer, the accumulated performance monitoring information 18 of the corresponding connection identifier 14 in the performance monitoring information table 9 is read.

FIG. 3 is a block diagram of an asynchronous transfer mode transmission unit performance monitoring information table according to the present invention. In the performance monitoring information 18 of FIG. 2, a performance monitoring initialization status bit 24, (XOR) with the accumulated BIP-16 information of the BIP-16 calculation result of the payload portion of the cell to update with the new accumulated BIP-16.

In addition, the number of first total user cells (total user cell number (releated to CLP = 0, TUCO) 29, which is cell number accumulation information, and the total number of total user cells (related to CLP = 0,1, TUC0 + 1) (28).

That is, if CLP = 0, 1 is added to the first total user cell number 29 and the second total user cell number field 28, and if CLP = 1, only the second total user cell number 28 1 is added.

The cumulative BIP-16 30, the first total number of user cells 29, and the second total number of user cells 28, which are the updated new block error detection codes, are recorded in the performance monitoring information table 9 .

Meanwhile, the forward performance monitoring operation and maintenance cell second total user cell value (FTUC0 + 1) 31, which is information of the second total user cell number 28 recorded at the time of generation of the previous forward performance monitoring operation and maintenance cell, 26 of the performance monitoring information 18 when the difference between the current total number of user cells 28 and the current total number of user cells 28 is the set block size B /

The bit in the connection identifier waiting state 26 is '0' when there is no idle identifier for generation of the forward performance monitoring operation and maintenance cell in the connection identifier holding first selection unit 6, '1' to be.

If the connection identifier waiting state 26 is '1', it indicates that the connection identifier 19 for recording the forward performance monitoring operation and the maintenance cell has already been recorded in the connection identifier storage first input / output unit 6.

Therefore, it is not necessary to record the connection identifier 19 in the forward connection identifier beam splitting first selection part 6.

If the waiting identifier state information 26 is '0', '1' is recorded in the waiting identifier state information 26, and the corresponding connection identifier 19 is stored in the identifier for storing the forward performance monitoring operation and the maintenance cell And records it in the selected portion 6.

The release of the idle identifier state information 26 to '0' is performed after the forward performance monitoring operation and maintenance cell generation unit 8 generates the forward performance monitoring operation and maintenance cell 21 to '0' Release.

FIG. 4 is a flowchart of a forward performance monitoring operation and maintenance cell generation process according to the present invention. In the forward performance monitoring operation and maintenance cell generation unit 8, If there is a connection identifier 19 recorded in the identifier storage first-in-first-out unit 6 (step 36), the forward performance monitoring operation and maintenance cell generation identifier recorded in the identifier storage first-in-first-out unit is read.

After reading the identifier, the cell is generated (37) in the form of a forward performance monitoring operation and maintenance cell with the performance monitoring result information 20 of the corresponding identifier of the performance monitoring table 9 and then forwarded to the physical layer transmission unit And maintenance cell 21 (38).

FIG. 5 is a block diagram of a forward performance monitoring operation and maintenance cell according to the present invention. FIG. 5 is a block diagram of a forward performance monitoring operation and maintenance cell 21 in the forward performance monitoring operation and maintenance cell 21 of FIG. A first total user cell number (FTUCO0) (31) at the time of generation of the forward performance monitoring operation and maintenance cell and the number of total user cells (TUC0) 44 and the second total user cell number And the second total number of user cells 32 at the time of generation of the maintenance cell.

In addition, BIP-16 (30) information, which is a block error detection code in the performance monitoring information table 9, is initialized to B 0000000000000000.

The virtual path identifier 39, the virtual channel identifier 40, and the connection information (segment / end-to-end 26) and the virtual path identifier 40, which are cell head information, are generated for the generation of the forward performance monitoring operation and maintenance cell 21, Connection type 25) in the performance monitoring information table 9. [

The forward performance monitoring operation and the maintenance cell generation flow for the above are the same as the fourth embodiment.

In the physical layer cell transfer section 9, the cell synchronization signal 16 and the cell existence notification signal 15 input from the cell reception section 4 are transmitted to the cell reception section 4 or the forward performance monitoring operation and maintenance cell generation section 4. [ Determines whether to receive the cell from the base station 8, and transfers it to the physical layer.

That is, if the cell existence notification signal 15 has a logic level of '1', the cell reception unit 4 receives the cell, and when the logic level is '0', the cell generated by the forward performance monitoring operation and maintenance cell generation unit 8 And transmits the generated forward performance monitoring operation and maintenance cell 21 to the physical layer.

As described above, the asynchronous transfer mode forward performance monitoring operation and maintenance cell 21 can be generated.

The present invention monitors the transmission status of a virtual connection in an asynchronous transfer mode (ATM) network and generates forward performance monitoring operation and maintenance cells required for performance monitoring among operation and maintenance (OAM) functions performed to detect a failure It is possible to solve the above-mentioned problems caused by processing the two cell buffers through the connection identifier storage buffer and appropriate control, and to produce accurate performance monitoring operation and maintenance cells.

The present invention relates to a method and apparatus for monitoring a transmission state of a virtual connection in an asynchronous transfer mode (ATM) network and generating forward performance monitoring operation and maintenance cells for performance monitoring among operation and maintenance (OAM) Economically.

Claims (5)

A method for generating a forward performance sensing operation and maintenance (OAM) cell in an asynchronous transfer mode (ATM) layer, comprising: a first step of receiving an internal cell and a connection identifier used in the asynchronous transfer mode switcher from an asynchronous transfer mode switch; ; Performing a performance monitoring on a cell transmitted from the switch to the physical layer; A third step of managing performance monitoring information for storing the performance monitoring information; A fourth step of storing the connection identifier in a first-in first-out manner for generation of the forward performance monitoring operation and maintenance cell; And transferring the generated cell to the physical layer after performing the fourth step. The method of claim 1, wherein the forward performance monitoring operation and the maintenance cell generation of the asynchronous transfer mode layer are performed. The method of claim 1, wherein the asynchronous transmission mode layer and the asynchronous transmission mode layer are simultaneously input to the asynchronous transmission mode cell and the connection identifier information from the outside for performance monitoring in the asynchronous transmission mode layer. How to create a cell. 2. The method of claim 1, wherein the second step uses a first-in first-out (FIFO) buffer to store the connection identifier. 2. The method of claim 1, wherein the third step is to store the virtual path identifier, virtual channel identifier, and connection information included in the forward performance monitoring operation and maintenance cell head to be generated in the performance monitoring table. A method for generating a forward performance monitoring operation and a maintenance cell in a mode layer. The method as claimed in claim 1, wherein the fourth step includes a step of waiting for generation of a forward performance monitoring operation and a maintenance cell in response to a transmission cell existence signal output from the reception unit until there is no user cell transmission after monitoring the performance, And the connection identifier is stored in the asynchronous transfer mode layer.