JPH0730578A - Communication traffic monitor system - Google Patents

Abstract

PURPOSE:To improve the quality of a transmission cell by allowing a contention control means to output an output enable cell when an input cell does not keep a predetermined traffic characteristic and the output enable cell is stored in a violation cell storage means. CONSTITUTION:When a cell reaches a policing controller 11, a contention control section 13 receives a signal from the controller 11 and checks whether or not a cell of the same information sender as the arrived cell is in existence in a violation cell storage section 12 and aborts a relevant cell in the storage section 12 when in existence. When the arrived cell keeps the specified traffic characteristic, the arrived cell is outputted to a network. When not, the arrived cell is sent to the storage section 12. When the specified value is not satisfied or no cell reaches the controller 11, and when an output enable cell in the storage section 12 is in existence, the control section 13 outputs an oldest cell to the network and when no output enable cell is in existence, an idle cell is outputted to the network. As a result, number of violation cells is reduced and the quality of the cell is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication traffic monitoring system in which a traffic type correction operation is performed on a cell in a network such as an ATM network and the cell is transmitted.

[0002]

2. Description of the Related Art In an ATM network, information is divided into cells and transmitted from a header showing routing information to a receiving side. In order to reliably transmit the received cells to the receiving side with the defined communication quality, the network performs call admission control according to the defined traffic characteristics.

Here, in a small-scale network, if the line between the sender and the receiver is in a low load state, the risk of falling into congestion is small even if information about violation of a specified value is transmitted by control.
However, in a large-scale network, it is difficult to grasp the line usage status between the sender and the receiver and control the entire system. Call admission control is performed based on the traffic characteristics. Is at a high risk of not being able to guarantee communication quality. Therefore, it is a problem whether the received cell complies with the traffic characteristics. That is, the input cell must comply with the traffic characteristics, and it is necessary to monitor such as discarding the non-compliant cell before outputting to the network. However, if discarded, the cell quality of the sender deteriorates, and if large traffic characteristics are specified to avoid it, problems such as inefficient use of the network occur.

[0004]

In the conventional traffic monitoring system, if the input cell does not satisfy the specified traffic characteristics, it is uniformly discarded as a violating cell and communication quality is deteriorated. Further, if a large traffic characteristic is specified to avoid this, there is a drawback that the network cannot be used efficiently.

The present invention is a communication traffic monitoring system for preventing the deterioration of communication quality by accumulating illegal cells evenly without discarding them and outputting them according to the subsequent input cell status and network congestion state. To provide.

[0006]

According to the present invention, there is provided policing control means for deciding whether or not an input cell adheres to predetermined traffic characteristics, and it is determined by this policing control means not to adhere to predetermined traffic characteristics. If the violating cell accumulating means for accumulating the cell, and if it is determined by the policing control means that the predetermined traffic characteristics are maintained, the cell is output via the network, and the violating cell accumulating means stores the cell as the cell. Competing control means for discarding the same cell if the same cell is accumulated, if the cell is not input in the policing control means or if it is determined that the input cell does not comply with predetermined traffic characteristics, The contention control means outputs the output-enabled cell through the network when the output-enabled cell is stored in the violating cell storage means. It is an feature.

[0007]

According to the present invention, in order to satisfy the traffic characteristics specified for the input cell and to send it out to the network, the traffic type correction operation is performed on the cell violating the specified value to reduce the violating cells. The cell originator does not always use the declared band with respect to the declared default value. Therefore, even if the specified value is violated temporarily, it is not sent to the network in that state, but if it can be stored until the cell input below the declared band is stored, it is sent, and then the used band is smoothed, and as a result This has the effect of reducing violating cells and improving cell quality.

[0008]

First Embodiment A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of a communication traffic monitoring apparatus according to this embodiment.

The policing control device 11 determines whether the input cell complies with the traffic characteristics defined for each information sender (VC), and outputs the cell to the network side or to the violating cell storage section 12. Is output to the competition control unit 13. The competition control unit 13 uses the policing control device 11
When a violation cell storage unit access signal is received from, the control is performed to discard the cells in the violation cell storage unit 12 or output the cells to the network.

FIG. 2 is a flow chart showing the operation of the apparatus according to this embodiment. For example, if a cell arrives at the policing controller 11 in step 101, first step 1
In 02, the contention control unit 13 receives the signal from the policing control device 11 and checks whether or not there is a cell with the same VC as the arrival cell in the violating cell storage unit 12, and if there is, in the violating cell storage unit 12 in Step 103. Discard the cell in question. If the arrival cell complies with the defined traffic characteristics in step 104, the arrival cell is output to the network in step 105,
Otherwise, in step 106, the arriving cell is sent to the violating cell accumulating unit 12. If the specified value is not satisfied, or if the cell does not arrive at the policing control device 11, the competition control unit 13 determines in step 107 that if there is a cell in the violable cell storage unit 12 in the output enabled state, the oldest in step 108. The corresponding cell is output to the network, and if there is no outputable cell, an empty cell is output to the network in step 109.

FIG. 3 is a diagram showing input traffic and used bandwidths of the traffic monitored by the apparatus according to the present embodiment. Example 2 An example in which the input information has priority and non-priority will be described with reference to FIG.

In the policing controller 21, the input cell is V
It has a function of determining whether the traffic characteristics specified for each C are observed and outputting to the contention control unit 23 whether the cell is output to the network side, output to the violating cell storage unit 22 or discarded. Upon receiving the violation cell storage unit access signal from the policing control device 21, the contention control unit 23 controls whether the cells in the violation cell storage unit 22 are discarded or output to the network.

FIG. 5 is a flow chart showing the operation of the apparatus according to this embodiment. For example, if a cell arrives at the policing control device 21 in step 201, first, in step 202, the same V as that of the arriving cell is stored in the violating cell storage unit 22.
Check whether cell C exists, and if yes, step 203.
Check the priority of the arriving cell in step 20.
At 4, the corresponding cell in the violating cell storage unit 22 is discarded, and the arriving cell continues to the following processing. If it is not prioritized, the arriving cell is discarded in step 205, and if the corresponding cell in the violating cell accumulating unit 22 can be outputted, it is outputted to the network.

If there is no cell having the same VC as the arriving cell in the violating cell storage unit 22 or if there is priority to the arriving cell, it is checked in step 206 whether the arriving cell satisfies the specified value. If yes, the data is output to the network in step 207.
Send to. If the specified value is not satisfied or if the cell does not arrive at the policing control device 21, if there is a cell in the violable cell accumulating unit 22 in the output enabled state in step 209, the oldest relevant cell is transferred to the network in step 210. If there is no outputable cell, the empty cell is output to the network in step 211.

Embodiment 3 An embodiment in which the input information is monitored independently of the maximum rate and the average rate will be described with reference to FIG.

The peak rate policing control device 31 is
A function for determining whether the input cell is observing the peak rate defined for each VC and outputting to the competition control unit 34 whether the cell is output to the average rate policing control device 32 or the violated cell storage unit 33 is provided. To have. The average rate policing control device 32 has a function of determining whether the input cell is observing the average rate defined for each information sender, and outputting to the contention control unit 34 whether the cell is output to the network or discarded. . When the contention control unit 34 receives the access signal of the violating cell storage unit from the peak rate and average policing control devices 31 and 32, it controls whether the cell in the violating cell storage unit 33 is discarded or is output to the network. is there.

FIG. 7 is a flow chart showing the operation of the apparatus according to this embodiment. For example, when a cell arrives at the peak rate policing control device 31 in step 301, first, if the arriving cell does not comply with the defined peak rate in step 302, the cell is sent to the violating cell accumulating unit 33 in step 304. If so, it is sent to the average rate policing control device 32, and if the average rate defined in step 303 is not observed, the arriving cell is discarded in step 305, and if it is observed, step 306.
At, it is checked whether or not there is a cell of the same VC in the violated cell accumulating unit 33, and if it exists, it is discarded at step 307 and the arriving cell is output to the network at step 308. If the specified peak and average rates are not satisfied, or if the cell does not arrive at the peak rate policing control device 31, in step 309, if there is a cell in the violable cell storage unit 33 in the output enabled state, step 310. Then, the oldest applicable cell is output to the network, and if there is no outputable cell, an empty cell is output to the network in step 311.

Embodiment 4 An embodiment of a system for switching monitoring depending on the state of the network will be described with reference to FIG. The policing control device 41 determines whether the input cell complies with the traffic characteristics specified for each VC, and determines whether the cell is output to the network side, discarded, or output to the violating cell storage unit 42. With the function to output to. However, it is discarded only when the network is congested. When the contention control unit 43 receives the access signal for the violating cell storage unit from the policing control unit 41, it controls whether the cell in the violating cell storage unit 42 is discarded or is output to the network.

FIG. 9 is a flow chart showing the operation of the apparatus according to this embodiment. For example, if a cell arrives at the policing control device 41 at step 401, it is first determined at step 402 whether or not the arriving cell satisfies the specified value.
If satisfied, in step 403 it is checked whether or not there is a cell with the same VC as the arriving cell in the violating cell storage unit 42,
If there is, the corresponding cell in the violating cell storage unit 42 is discarded in step 404. Then, in step 405, the arrival cell is output to the network. If the arrival cell does not satisfy the specified value, the network state signal is received in step 406 to check whether the network is in a congestion state. If the congestion state is reached, the arrival cell is discarded in step 407. If it is not in a congestion state, it is checked in step 408 whether there is a cell having the same VC as the arrival cell in the violating cell accumulating unit 42, and if there is, the cell in the violating cell accumulating unit 42 is discarded in step 409. After that, in step 410, the arriving cell is sent to the violating cell storage section. If the arriving cell does not satisfy the specified value or if the cell does not arrive at the policing control device 41, if there is a cell in the violable cell accumulating unit 42 in the output enabled state in step 411, the oldest applicable cell in step 412. Is output to the network, and if there are no outputable cells, an empty cell is output to the network in step 413.

The above-described fourth embodiment has a function of switching monitoring depending on the state of the network added to the system of the first embodiment. Similarly, for the above-described second and third embodiments, the policing control device also includes a device having a function of switching between discarding the violation information and sending it to the violation cell accumulating unit depending on the state of the network.

[0021]

According to the present invention, by storing the violating cells without discarding them, it becomes possible to send them to the network by the subsequent traffic type correction processing. Therefore, the quality of the cell transmitted between terminals can be improved. The effect of being connected to is obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a processing flowchart of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a used band of input / output information according to the present invention.

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is a processing flowchart of the second embodiment of the present invention.

FIG. 6 is a configuration diagram of a third embodiment of the present invention.

FIG. 7 is a processing flowchart of the third embodiment of the present invention.

FIG. 8 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 9 is a processing flowchart of the fourth embodiment of the present invention.

[Explanation of symbols]

 11, 21, 41 ... Policing control device 12, 22, 33, 42 ... Violated cell storage unit 13, 23, 34, 43 ... Contention control unit 31 ... Peak rate monitoring policing control device 32 ... Average rate monitoring policing control device

Claims (2)

[Claims] 1. A policing control means for determining whether or not an input cell adheres to a predetermined traffic characteristic, and a violation for accumulating the cell when the policing control means determines that the input traffic cell does not adhere to the predetermined traffic characteristic. When it is determined by the cell storage means and the policing control means that a predetermined traffic characteristic is being protected, the cell is output via the network, and the same cell as the cell is stored in the violating cell storage means. Contention control means for discarding the same cell, and when the cell is not input in the policing control means or when it is determined that the input cell does not comply with a predetermined traffic characteristic, the contention control means accumulates the violating cell. Communication traffic characterized in that the output-capable cell is output through the network when the output-capable cell is stored in the means Monitoring method. 2. The contention control means comprises means for detecting whether or not the network is in a congestion state, and when the policing control means determines that the input cell does not comply with a predetermined traffic characteristic, the network is 2. The communication traffic monitoring method according to claim 1, wherein the input cell is discarded when it is in a congestion state.