JP2950291B2 - Time-sharing OAM processing method in ATM - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 1. Field of the Invention [0002] The present invention relates to software processing of an OAM function of an ATM system, and more particularly to a method for reducing the number of processing steps and the required number of processor cores.

[0001]

2. Description of the Related Art Conventionally, this type of OAM processing system determines the cell type of an input ATM cell and performs necessary processing for each cell type such as various OAM cells, user cells, and empty cells. Also, for ATM cells with complicated processing and large processing amount such as various OAM cells, one cycle of software program processing is defined as one cell transit time.
Tasks to be processed within one cell transit time for each input ATM cell type (various OAM cells, user cells, empty cells)
Task 2 which does not necessarily need to be processed with the accuracy of a sampling interval equivalent to one cell transit time, and must always be processed in common regardless of the type of input ATM cell.
Various types of tasks are serially processed on the time axis.

Due to the relationship between the logical interface speed of an input ATM cell signal and the processing capability speed of a processor that performs software processing, if there is an OAM cell in which one cycle of program processing does not end in one cell transit time, the required processing amount is reduced. The number of processor cores was increased in accordance with the processing speed of the processor.

[0003]

Problems to be Solved by the Invention OA of ATM system
In the software processing method of the M function, one cycle of software program processing is defined as one cell transit time, and tasks to be processed within one cell transit time for each input ATM cell type (various OAM cells, user cells, empty cells). And two types of tasks, which do not necessarily need to be processed with a sampling interval accuracy equivalent to one cell transit time and must be constantly processed in common regardless of the type of input ATM cell, on the time axis. When the processing is performed, the number of processing steps for an ATM cell having a complicated processing and a large processing amount such as various OAM cells has a large value. Therefore, depending on the relationship between the logical interface speed of the input ATM cell signal and the processing capability speed of the processor that performs software processing, one cycle of the program processing takes one cycle.
There is a problem that some OAM cells do not end in the cell transit time.

If one cycle of the program processing does not end in one cell transit time, there is a problem that the number of processor cores must be increased in accordance with the processing capability speed of the processor with respect to the required processing amount.

The present invention has been made in such a background. In the software system of the OAM function of the ATM system, an ATM cell having a complicated processing and a large amount of processing, such as various OAM cells, is used. It is an object to reduce the number of processing steps corresponding to one cell time unit.

[0006] Further, by reducing the number of processing steps,
It is an object of the present invention to reduce the number of required processor cores depending on the relationship between the logical interface speed of an input ATM cell signal and the processing capability speed of a processor that performs software processing.

[0007]

In order to solve the above problems, the time division OAM processing method in the ATM according to the present invention is designed so that the task is executed within one cell passage time for each input ATM cell type.
The first task to be processed in the
It is not necessary to process with the accuracy of the pulling interval and the input AT
A second process that always performs common processing regardless of the type of M cell
Tasks and perform processing related to maintenance or operation.
A time division OAM processing method in ATM
When one input ATM cell passes through the M cell input signal
In the meantime, the first task is processed and the first task is performed.
Process and the time division process of the second task are performed in one cell.
Time-division processing of the second task so that it is completed within the overtime
It is characterized in that that.

Here, the time division O in the ATM of the present invention is
A first task in the AM processing method is to perform input OAM cell data analysis processing for analyzing data of input OAM cells, input user cell data analysis processing for analyzing input user cells, or output OAM cell generation for generating output OAM cells. It is characterized in that any one of the processes includes at least one process. The second task is VP-
VP-RDI cell specified occurrence interval measurement processing for measuring a specified occurrence interval of an AIS cell or a VP-RDI cell, or A
It is characterized by including at least one of a non-reception time management process for managing a time during which no TM cell input signal is received.

[0009]

As a result , time division OAM in ATM
In the processing method , the number of the plurality of processor cores can be reduced based on the logical interface speed of the input ATM cell signal and the processing capability speed of the processor that performs software processing .

One cycle of software program processing is defined as a transit time of a plurality of cells (for example, N cells), and it is not always necessary to perform processing with a sampling interval equivalent to the transit time of one cell, and is common regardless of the type of input ATM cell. Time-divisional processing of tasks that should be constantly processed by N cell transit time reduces the portion occupied by the task to about 1 / N of the processing amount to be processed within one cell transit time of ATM cells. , The number of processing steps can be reduced accordingly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a time division OAM processing method in an ATM according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a flowchart showing an embodiment of an OAM processing method in an ATM according to the present invention.

As shown in FIG. 1, the tasks to be processed in the software processing of the OAM function of the ATM system are defined as input AAM cell data analysis function, input user cell data analysis function, output OAM cell generation function, etc.
Tasks to be processed within one cell transit time for each TM cell type (various OAM cells, user cells, empty cells), and VP
-AIS cell and VP-RDI cells do not always need to process at the sampling interval accuracy equivalent to one cell transit time, such as the function of measuring the specified generation interval of the VP-RDI cell and the function of managing the unreceived time, and are common regardless of the type of the input ATM cell. Is divided into two types of tasks that must be constantly processed.
One cycle of the software program processing is defined as a transit time of a plurality of cells (for example, N cells). Of the two types of task processing, it is not necessary to perform the processing at a sampling interval equivalent to the transit time of one cell. A
A processing configuration is provided in which tasks that should always be processed in common, regardless of the type of TM cell, are time-divisionally processed by N cell transit times.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.

The software cyclically assigns a sequence number from 1 to N to the received ATM cell (assuming that one cycle of the program processing is N cell transit time) and manages it by itself. When an ATM cell is received,
Among the common processing units corresponding to tasks that must be constantly processed irrespective of the type of input ATM cell, according to the input ATM cell sequence number (here, k is assumed) managed by itself. 1 common processing unit k
/ N after performing the processing corresponding to / N
The TM cell type is determined.

In the determination of the ATM type, the OAM cell, the user cell, and the empty cell are determined. Among the OAM cells, the VP-AIS cell, the VP-RDI cell, the performance management cell, the loopback cell, The determination of the cell for stop and the like is performed, and the processing within one cell time according to each type shown in FIG. 1 is performed.

Next, when the input ATM cell sequence number managed by itself is less than N, processing is started again from the reception of the ATM cell. When the ATM cell sequence number becomes N, one cycle of the program processing is executed. N equivalent to
When the cell time elapses, the process ends.

In FIG. 1, software assigns sequence numbers 1 to N to received ATM cells cyclically (assuming that one cycle of program processing is N cell transit time) and manages the ATM cells by itself. The value of N shown here depends on the VP-AIS cell, VP-
It is determined by the relationship between the sampling interval of the measurement time required for the specified generation interval measurement function of the RDI cell and the unreceived time management function, and the processing capability speed of the processor core that performs processing.

Next, when the software receives an ATM cell (step A1 in FIG. 1), the software does not always need to perform processing with the accuracy of a sampling interval equivalent to one cell transit time, and is common regardless of the type of input ATM cell. Among the common processing units corresponding to tasks that must be constantly processed, the common processing unit k / N shown in FIG. 1 corresponds to the input ATM cell sequence number managed by itself (here, k is assumed). (Steps A2 and A3). Here, tasks that must always be processed in common regardless of the type of the input ATM cell include VP
-AIS cell, VP-RDI cell specified interval generation function, and unreceived time management function. These functions are performed by the input ATM cell by the VP-AIS as the management of the transmission interval of the cell transmitted at a fixed period and the management of the duration of the state.
It is necessary to continuously process not only cells and VP-RDI cells, but also continuously.

The VP-AIS cell is an ATM cell to be generated to notify a downstream device of an alarm status for each VP when a failure in a transmission line is detected.
The specified generation interval of the IS cell is 1 second per 1 VP, and the specification allows a tolerance of ± 10 msec. Where ATM
Cell input interface logic rate is 155.52 Mb
In the case of ps, the transit time of one cell is about 2.8 μsec, and in order to cope with the tolerance of 10 msec, 10 m is required.
sec ÷ 2.8 μsec = 3571 It is sufficient to measure the specified time interval at a sampling interval corresponding to the cell time.

Also, the downstream device detects the VP-AIS state by receiving the VP-AIS cell.
The release condition of the VP-AIS state is that the VP-AIS cell has not been received for 3 seconds, and a tolerance of ± 500 msec is recognized by definition. To address this tolerance, 500 mse
c ÷ 2.8 μsec = 178571 It is sufficient to measure the specified generation time interval at a sampling interval corresponding to the cell time.

The VP-RDI cell, when detecting a VP-AIS cell transmitted from the upstream, generates an AT to notify the upstream apparatus of the detection of the cell.
Although the cell is an M cell, the specified generation interval of the VP-RDI cell is 1 second for every 1 VP, and a tolerance of ± 10 msec is recognized in the specification. In order to cope with this tolerance of 10 msec, as in the case of the VP-AIS cell, 10 msec ÷
At a sampling interval equivalent to 2.8 μsec = 3571 cell time, the specified generation time interval may be measured.

On the other hand, the upstream device detects the VP-RDI state by receiving the VP-RDI cell.
The condition for releasing the VP-RDI state is that the VP-RDI cell has not been received for 3 seconds, and a tolerance of ± 500 msec is recognized by definition. To address this tolerance, 500 mse
c ÷ 2.8 μsec = 178571 It is sufficient to measure the specified generation time interval at a sampling interval corresponding to the cell time.

As described above, the VP-AIS cell,
The sampling interval of the measurement time required for the specified generation interval measurement function of the VP-RDI cell and the unreceived time management function is as follows.
This is a value having a very long time interval, and one cell transit time (2.
It is not necessary to measure with a sampling interval accuracy of 8 μsec), and these common processes can be divided and dispersed within a plurality of cell passing times.

In this type of OAM software processing, generally, the number of steps that can be processed within one cell passage time must be kept within a certain value according to the processing speed of the processor core. Here, in the conventional example shown in FIG. 2, if serial processing is performed within one cell transit time without dividing the common processing part into N, the amount to be processed within one cell transit time will be smaller than that of the common processor. The value is about N times that of the invention, and cannot be accommodated within the specified number of steps.

Therefore, in the present invention, since the sampling interval of the measurement time required for the common processing unit can be a large value as described above, the value of N is increased, and the common processing unit is divided into N parts. Reduce the number of steps. Here, by increasing the value of N to the point where the number of processor cores can be accommodated by one, it is possible to realize a function that could not be realized without processing by a plurality of processor cores with a single processor core. it can.

After the end of the N-divided common processing, the software determines the type of ATM cell indicated by the input data (step A4) and distinguishes between OAM cells, user cells, and empty cells. Here, in the OAM cell, the VP
-Determine the AIS cell, VP-RDI cell, performance management cell, loopback cell, start / stop cell, etc. After the child, the processing is performed within one cell time according to each type shown in FIG. 1 (step A5). These processes are different from the above-described common processes, and must be completed within one cell passage time.

Next, when the input ATM cell sequence number managed by the software is less than N, the software
The processing is performed again from the reception of the ATM cell, and when the ATM cell sequence number becomes N, the N cell time corresponding to one cycle of the program processing elapses and the processing ends (step A6).

In the above description, assuming that one cycle of processing is N cell transit time, the number of steps of the N-divided common processing unit and the one having the largest number of processing steps among the processes for each cell type are combined. The number of processing steps is reduced so that the value falls within the number of steps required for one cell transit time.

[0031]

As described above, in the present invention, the ATM is used.
In software processing of the OAM function of the system, one cycle of program processing is defined as a plurality of cell transit times,
Of the types of task processing, tasks that need not always be processed with the accuracy of a sampling interval equivalent to one cell transit time, and tasks that are to be constantly and commonly processed regardless of the type of input ATM cell, are performed using a plurality of cell transit times. Perform time division processing. As a result, the number of processing steps in one cycle of the program processing can be reduced, and the number of processor cores required depending on the relationship between the logical interface speed of the input ATM cell signal and the processing capability speed of the processor for software processing is reduced. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of an OAM processing method in an ATM according to the present invention.

FIG. 2 is a flowchart showing one embodiment of a conventional OAM processing method.

[Explanation of symbols]

Claims (3)

(57) [Claims] 1. A first task for processing a task within one cell transit time for each input ATM cell type, and a task that does not need to be processed with a sampling interval accuracy equivalent to one cell transit time, and Regardless of the time, the time division OA in the ATM is divided into a second task that always performs common processing and performs processing related to maintenance or operation.
M processing method , wherein one cell of the input ATM cell is
Processing the first task within a time period during which the first task is processed, and time-sharing the second task with the processing of the first task.
The process is completed so that the process is completed within the one cell passage time.
2. A time-sharing OAM processing method in an ATM , wherein time-sharing processing is performed on two tasks . 2. The first task is an input OAM cell data analysis process for analyzing data of an input OAM cell, an input user cell data analysis process for analyzing an input user cell, or an output OAM for generating an output OAM cell. 2. The ATM according to claim 1, wherein any one of the cell generation processes includes at least one process.
Time division OAM processing method. 3. The VP-ADI cell or the VP-RDI cell specified occurrence interval measurement process for measuring a specified occurrence interval of a VP-RDI cell,
Or claim 1 or claim, characterized in that it includes at least one processing any unreceived time management process of managing the time that is not the reception of the ATM cell input signal
2. The time-sharing OAM processing method in the ATM according to 2 .