JPH03241944A - Cell flow monitor system - Google Patents

Abstract

PURPOSE:To detect momentary traffic fluctuation by resetting a cell number data by each call stored in a passing cell number storage memory section implemented at an interval of a prescribed time to only a call stored in a call identification number storage memory section. CONSTITUTION:When the count of passing cell number by each call is finished at a count means 1 for a prescribed time interval, a reset control section 6 initializes a passing cell number storage memory section 2. In this case, the passing cell number storage memory section 2 by the reset control section 6 is initialized for a call stored in a call identification number storage memory section 3. Thus, since only the cell number data of a call set in the communication line at that time is reset, the reset time is shortened and the passing cell number is counted in a shorter time interval. Thus, momentary fluctuation of traffic is detected.

Description

[Detailed Description of the Invention] [Summary] Regarding a cell flow rate monitoring method for managing traffic in an ATV switching network, etc., it is possible to shorten the time interval for measuring the number of cells and detect instantaneous traffic fluctuations. In a cell flow rate monitoring method that monitors the traffic on a communication path by counting cells with a predetermined data length sent out on the communication path, there is a call method that extracts the call identification number of the cell sent out on the communication path. an identification section, a passing cell number holding memory section for storing the number of cells for each predetermined time for each call, and a counting means for counting the number of passing cells for each call by referring to the number of cells stored in the passing cell number holding memory section. , a call identification number storage memory unit that stores the identification number of a call set on the communication path, and a call identification number storage memory unit that stores the number of passed cells by referring to the call identification number stored in the call identification number storage memory unit. and a timing generation section that controls the timing of the operation of these elements, and the cell count data for each call stored in the passed cell count storage memory section is carried out at predetermined time intervals. The resetting is configured to be performed only for calls stored in the call identification number holding memory section.

[Industrial application field]

The present invention relates to a cell flow rate monitoring system for managing traffic in an ATM switching network or the like.

[Conventional technology]

ATM (Asynchronous Trans)
In the switching method (fer Mode: asynchronous transfer mode), when a call setup request is received from the user, the user declares the average transmission speed, etc. Based on this, the bandwidth of the communication path is managed and traffic control such as routing is performed. ing.

However, if the communication information sent from the user is burst information, the traffic may increase over time and exceed the bandwidth capacity of the communication channel. Further, abnormal traffic, which is much larger than normal traffic, may occur and exceed the bandwidth capacity of the communication channel.

In order to prevent such a phenomenon, the number of cells that are manually connected to the communication path is counted for each call to manage the overall traffic.

FIG. 5 is a configuration diagram of a conventional cell flow rate monitoring device.

In the figure, the VCI (information such as a logical channel number determined in response to a call) of a cell on an input highway is latched in a register 10 in synchronization with a VCI latch clock, and the latched VCI is transferred to a selector 11. Manually input power to the X input terminal.

The selector 1 is a circuit that selects either the X input or the 7 inputs, and outputs the selected signal to the passing cell number holding memory 12 as an address signal.

The passing cell number holding memory 12 is a memory that stores the number of passing cells for each VCI, and memory areas 0 to n are for VCI.
It is set up in correspondence with. In addition, the cell count value of the cell clock or a cell valid signal from a processor (not shown) is stored in the memory 12 for holding the number of passing cells.
5 as a write signal.

When a specific address of the passing cell number holding memory 12 is designated by the selector 11, the number of cells stored at the corresponding address is read out.

Then, the adder 13 adds rl to the read value.
, are added and output to the selector 14's X input.

When counting cells, the X side input is selected in the selector 14, and the value added by "1" from the selector 14 is output to the corresponding address of the passing cell number holding memory 12,
Written as the added number of cells. In this way, the number of cells for each VCI is counted.

This counting of the number of passing cells is performed at fixed time intervals, and after a fixed time has elapsed, each selector l1.14.15
Y inputs are selected, and the cell number data in the passing cell number holding memory 12 is reset. That is, "0" from Y inputs of the selector 14 is sequentially written to the address of the passed cell number holding memory 12 specified by the cell clock count signal of the period counter 16, and the cell number data of the passed cell number holding memory 12 is written. will be reset.

[Problem to be solved by the invention]

Incidentally, in order to detect instantaneous fluctuations in traffic, it is desirable to count the number of passing cells at shorter time intervals.

However, in the above-described cell flow rate monitoring device, the next number of cells cannot be counted unless all the memory areas provided in the passed cell number holding memory 12 corresponding to the VCI are reset.

Therefore, there was a problem in that the time interval for measuring the number of cells could not be shortened to a certain time or less.

An object of the present invention is to shorten the time interval for measuring the number of cells so that instantaneous traffic fluctuations can be detected.

[Means to solve the problem]

FIGS. 1(a) and 1(b) are diagrams explaining the principle of the present invention.

In FIG. 1(a), the call identification unit 4 extracts the call identification number assigned to the cell sent out on the communication path.

The passing cell number holding memory section 2 stores the number of passing cells for each predetermined time period according to the call identification number extracted by the call identification section 4. For example, this passing cell number holding memory section 2
is provided with a memory area corresponding to the number of calls that can be set on the communication path, and is capable of storing the number of passing cells of each call.

The counting means 1 counts the number of passing cells for each call by referring to the number of cells stored in the passing cell number holding memory section 2.

The call identification number holding memory section 3 stores the identification number of the call set on the communication path.

Reset 7) The control section 6 refers to the call identification number stored in the call identification number holding memory section 3 and initializes the contents of the passed cell number holding memory section 2.

The timing generator 5 controls the operation timing of each of these elements.

[For production]

In the above configuration, when the counting means 1 finishes counting the number of passing cells for each call at a predetermined time interval, the reset control unit 6
The passed cell number holding memory section 2 is initialized by this.

At this time, the reset control unit 6 initializes the passing cell number holding memory unit 2 only for calls stored in the call identification number holding memory unit 3.

Therefore, it is only necessary to reset the cell count data of the call that is set on the communication channel at that time, so the reset time can be shortened and the number of passing cells can be counted in a shorter time interval. This makes it possible to detect significant fluctuations.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows the countries in which the ATM system is based on the cell flow rate monitoring method of the present invention.

In the figure, multiple input highways (communication paths) include:
A cell flow rate monitoring device 2 (and a cell input regulating device 22 are each provided.The cell flow rate monitoring device 21 counts the number of cells sent out on the highway for each call, and the counting results are used for call setting. This is a device that monitors whether the number of cells is within the number of declared cells declared by the user.When the number of counted cells exceeds the number of declared cells, the cell manual control!
The J device 22 is notified of this and is made to regulate the cell flow rate.

The human cell regulation device 22 regulates the number of cells on the highway based on the signal from the cell flow rate monitoring device 1, and outputs the manually produced cells to the ATM exchange channel 23.

Next, FIG. 4 is an overall configuration diagram of a cell flow rate monitoring device 21 based on the cell flow rate monitoring method of the present invention, and FIG. 3 is a configuration diagram of its main parts.

First, the operation of cell flow rate detection will be explained with reference to FIG.

In FIG. 3, the VCl (logical channel number) of a cell on the human-powered highway is latched into a register 31 with timing synchronized with the VCI latch clock. Here, V
CI is a logical channel number assigned to each call when a call setup request is received from a user, and is stored in the header of each cell.

The VCI latched in the register 31 is outputted as an address designation signal to the passing cell number holding memory 33 via the X-side input of the selector 32. Also, at this time, the selector 34
The valid signal of the cell input to the X-side input terminal of the cell is given as a write enable signal to the passed cell number holding memory 33.

The passing cell number holding memory 33 is a memory for storing the number of cells for each call, and is provided with memory areas for the number of VCIs. The adder 35 adds "1" to the output data of the passing cell number holding memory 33, and the addition result is written to the original address via the selector 36.

These operations are repeated for each cell, and the cumulative number of cells for each call within a certain period of time is stored in the passing cell number holding memory 33.

(2) The CI holding memory 37 is a memory that stores calls existing on the input highway, that is, VCr. In this embodiment, the VCI holding memory 37 is provided with a memory area for the number of VCIs, and the VCI holding memory 37 is provided with a memory area for the number of VCIs.
A processor (not shown) writes VCl together with a valid signal in order from the smallest number in the memory, and an invalid signal is written in the memory area where the VCl used at the time of call release is written.

The VCI holding memory 37 also includes a period counter 3 which is manually input to the R input terminal of the selector 38 at the time of reset.
A count value of 9 is given as an address signal, and data in the VC1 holding memory 37 is read out based on the address signal.

Next, a description will be given of the operation when the passing cell count holding memory 33 is reset after counting the number of cells at fixed time intervals is completed.

At reset, the processor selects selectors 32 and 34.
and 36 are switched to the Y input side, and selector 3 is switched to the R input side. At this time, the processor writes valid signals for VCIs existing on the human-powered highway and invalid signals for MCIs that do not exist in the vCI holding memory 37 in order from the smallest memory address number.

The selector 38 outputs a count signal of the cell clock from the period counter 39 which is input to the R input terminal, and the addresses of the vC2 holding memory 37 are sequentially designated by this count signal.

At the time of reset, the processor does not output a write enable signal, so it enters data read mode, and the VCI read from the specified address is output to the Y input terminal of the selector 32, and the valid data stored corresponding to the VCI is output. , the invalid signal is Y of the selector 34
Output to the input terminal.

Then, the output of the selector 32, that is, the VCI read from the VCI holding memory 37, is given to the passing cell number holding memory 33 as an address signal. Further, the output of the selector 34, that is, a valid/invalid signal indicating whether or not a cell having the VCI exists on the highway is given as a write enable signal.

In the passing cell count holding memory 33, "0" data output from the selector 36 is written to addresses sequentially designated by the output of the selector 32 based on the write enable signal.

For example, when the data read from the CI holding memory 37 is an invalid signal, the passing cell number holding memory 3
No write enable signal is given to selector 3.
r□ output from 6.

No data is written.

On the other hand, when the data read from the VCI holding memory 37 is a valid signal, the passing cell number holding memory 33
is given a write enable signal, and the selector 36
A predetermined number of bits of "0" data outputted from the memory are written. As a result, the data of the number of cells at the specified address is transferred.

In this way, the VCI that exists on the human-powered highway is
By storing the addresses in the holding memory 37 in order from the smallest number, and resetting the data in the passing cell number holding memory 33 based on the data in the VCI holding memory 37,
Among the memory areas provided in the passing cell count holding memory 33 for the number of VCIs, only the memory areas that need to be reset can be reset. At this time,
The maximum address at which the valid VC ■ is stored in the VCI holding memory is given from the processor to the cycle counter 39, and the reset cycle is limited to that range. This results in
The time required for data reset can be shortened, the time interval for counting the number of cells for each call can be shortened, and instantaneous fluctuations in traffic can be detected.

Next, FIG. 4 shows a cell flow rate monitoring device 21 having the above-mentioned VCI holding memory 37, passing cell number holding memory 33, etc.
FIG.

In this cell flow rate monitoring device 21, when setting up a call, the user is asked to declare in advance how much information will be sent, and based on the declaration, the processor stores the number of declared cells for each VCI in the declared cell number holding memory 40. I try to write it down.

The declared cell number holding memory 40 has a memory area corresponding to, for example, n VCIs, and writes or reads the declared cell number for each VCI based on the address and write enable signal output from the selector 41. Execute.

The VCI latched in the register 31 (FIG. 3) is input to the R input terminal of the selector 41, and the VC output from the processor when writing the number of declared cells is input to the W input terminal.
I am inputting.

Here, the operation of the cell flow rate monitoring device in a state where the number of cells declared by the user is written in the declared cell number holding memory 40 will be described.

The VCI of the cell on the input highway is latched by the register 31 and applied to the R input terminal of the selector 41. At this time, the R input terminal of the selector 41 is selected,
When the address of the declared cell number holding memory 40 is designated by this VCI, the corresponding declared cell number is read out.

The number of cells read from the declared cell number holding memory 40 is:
A manual input is made to the B input terminal of the comparator 42. The A input terminal of the comparator 42 is inputted with the result of addition of the number of cells by the adder 35, the comparator 42 compares the value input to the re-input terminal, and the comparison result is output to the AND gate 43. .

A cell valid signal from the processor is input to the other input terminal of the AND gate 43, and when the cell valid signal is enabled, the comparison result from the comparator 42 is outputted to the cell input regulating device 22. Ru.

For example, if the counted value of the number of cells exceeds the declared number of cells at a certain point, the comparator 42 outputs a high-level signal indicating that A>B to the AND gate 43. At this time, since the number of cells is being counted, a cell valid signal is output from the pro sensor, and a signal indicating that the number of cells has exceeded the declared number is treated as a violation signal by the cell manual control device 22. is output to.

The cell human power regulating device 22 regulates the cell flow rate of the corresponding VCI based on, for example, this violation signal.

As described above, in the above embodiment, the VCI that actually exists on the highway is stored in the vC ■ holding memory 37, and based on the information in the VCI holding memory 37, the number of cells of the corresponding VCI in the passing cell number holding memory 33 is Since the reset time is cleared, the memory 33 that holds the number of passed cells
The number of passing cells can be counted at shorter time intervals without being limited by the number of VCIs mentioned above.

This makes it possible to detect instantaneous traffic fluctuations, making it possible to more stably control rope traffic.

(Effects of the Invention) According to the present invention, by resetting the memory that stores the counting results of the number of cells for each call only for calls that actually exist on the communication path, the reset time can be shortened. The number of cells can be counted at intervals.This allows detection of instantaneous traffic fluctuations.

4...Call identification unit, 5...timing generation section, 6...Reset control section.

Claims (1)

[Scope of Claims] 1) In a cell flow monitoring method that monitors traffic on a communication path by counting cells having a predetermined data length sent out on a communication path, a call identification number of a cell sent out on the communication path is provided. A call identification unit (4) that extracts the number of cells, a memory unit (2) that stores the number of cells for each call for each predetermined time, and a memory unit (2) that stores the number of cells stored in the memory unit (2) that stores the number of cells stored in the memory unit (2). Counting means (1) for referencing and counting the number of passing cells for each call
and a call identification number storage memory unit (3) that stores the identification number of a call set on the communication path, and a call identification number storage unit (3) that stores a call identification number that is set on the communication path, and a call identification number storage unit (3) that stores a call identification number that is set on the communication path. a reset control section (6) that initializes the contents of the number holding memory section (2); and a timing generation section (5) that controls the timing of the operations of these elements; Holding memory section (2)
A cell flow rate monitoring system characterized in that cell count data for each call stored in the cell number data is reset only for calls stored in the call identification number holding memory section (3). 2) In a cell flow rate monitoring method that monitors traffic on a communication path by counting cells with a predetermined data length sent out on a communication path, the number of cells sent out on the communication path is counted for each call at predetermined time intervals. A counting means (1), a passing cell number holding memory (2) for storing the number of cells for each call counted by the counting means (1), and a call holding memory (2) for storing calls set on the communication path. 7), the cell number data for each call stored in the passed cell number holding memory (2) is reset at predetermined time intervals for the calls stored in the call holding memory (7); A cell flow rate monitoring method that is characterized by the following: