JP3171962B2 - Policing user interface method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a policing user interface system, and more particularly to a policing user interface system for monitoring the amount of ATM cells flowing from a user terminal.

[0002] In order to realize a high-speed and broadband integrated network (B-ISDN) for efficiently transmitting a large amount of information including voice, data, and wideband image data, and to reduce transmission costs, ATM (Asynchronous Transfer) is used. Mode: Asynchronous transfer technology) Research on transmission technology using networks is underway.

[0003] The ATM network unifies all information in a cell format composed of a header portion and a payload portion and asynchronously transmits a large number of nodes, that is, paths between ATM cross-connect devices, and uses an STM (Synchronous). Tra
nsfer Mode (synchronous transfer technology) Compared with a network, time slot assignment processing is less troublesome, so that it is suitable for distributed processing control and multiplex transmission with high flexibility is possible.

[0004] In such an ATM network, if there is no limit on the amount of ATM cells flowing from the user terminal, the traffic of the ATM network will be abnormal. Therefore, the traffic will not be abnormal for each user terminal. A policing user interface (policing method) for setting such a cell amount in a contract and checking whether the contract is violated is required.

[0005]

2. Description of the Related Art FIG.
A configuration example of a TM network is shown, where 1 is an ATM network.
Central monitoring center (O) that monitors the entire network NW
pS), 2 is a subscriber line terminal (SLT) that forms an interface with the user terminals 1a to Na, and 3 is an AT.
The transmission devices 4 and 5 provided between the subscriber line terminal devices 2 in the M network NW are the ATM networks N
W and user terminals 1a to Na and 1b to Nb, respectively, and a line terminating device (NT (Network Terminator) for terminating a subscriber line and providing a network interface.
ation)).

Next, the operation of this conventional example will be described with reference to FIG.
To explain with reference to (2), for example, when there is a call connection request from the user terminal 2a to the user terminal 2b, the ATM cell of the user terminal 2a is transferred to the subscriber line terminal equipment via the line termination device 4. 2 by identifying a virtual identifier VPI (Virtual Path Identifier) indicating a destination address provided in the header portion of the ATM cell.
Is connected to the other party's user terminal 2b via the.

At this time, the flow rate monitoring unit (UPC) 20 of the subscriber line terminal unit 2 monitors the amount of ATM cells of the user terminal 2a by policing, and when a violating cell group is detected, the violating cell group is detected. By discarding, the traffic amount of the ATM network NW is controlled.

[0008]

However, in the conventional policing user interface system as described above, as shown in FIG. 4 (2), whether the amount of ATM cells from the user terminal violates the contract or not. In fact, the criterion for determining whether or not to perform the determination is different from the criterion for discarding the offending cell group.

That is, even if the amount of ATM cells from the user terminal exceeds the criterion for determining whether or not the user violates the contract, the violating cell group is not immediately discarded, but is set to be less than the contracted cell amount. The violation cell group is discarded for the first time when the cell amount exceeds the violating cell discard standard.

Therefore, a surplus cell amount (hereinafter sometimes referred to as an offset cell amount) as a difference between the reference cell discarding amount and the contracted amount may flow into the ATM network without being actually discarded. When the surplus cells accumulate, there is a problem in that an abnormality occurs in the traffic to that extent, which affects the quality of service of the network.

Accordingly, it is an object of the present invention to prevent traffic abnormalities due to such accumulation of offset cell amounts and to protect the quality of network service.

[0012]

FIG. 1 shows a policing user according to the present invention for achieving the above object.
The operation of the interface method is shown in principle, and the operation will be described below with reference to FIG.

First, the amount of ATM cells flowing from the user terminal is monitored by the subscriber line terminal equipment 2. When the amount of ATM cells exceeds the contracted amount (step S1 in FIG. 1A), the contract is violated. It is determined that the violation cell group has not been discarded unless the violation cell discard reference amount set to be larger than the contract amount is exceeded.

Then, the AT exceeding the violation cell discard reference amount
When the amount of M cells flows in (step S2), the subscriber line terminal device 2 discards the violating cell group (step S3) and sends a violating cell discard notification to the central monitoring center 1 for the first time.

The central monitoring center 1 having received the notification of discard of the violating cell counts the number of discards of the violating cell group, and when the number of discards exceeds the threshold Th1 shown in FIG. 2B (step S4). A connection disconnection warning is issued to the offending user terminal through the monitoring control network CNW.

The user terminal violating this is AT
Since the amount of M cells is limited, it is possible to eliminate traffic abnormalities in the ATM network.

Further, according to the present invention, even though the disconnection warning is issued to the violating user terminal as described above, the discard of the violating cell group is continued due to the failure or intentional flow of the violating cells. The number of times is the threshold Th1
When the central monitoring center 1 detects that the threshold value has exceeded another larger threshold value Th2 (see FIG. 2B) (step S2).
5) This time, a notice of disconnection is issued to the violating user terminal, not a warning, and the subscriber line terminal device 2
To disconnect the offending user terminal from the ATM network.

Thus, it is possible to forcibly eliminate the traffic abnormality regardless of the intention of the user terminal.

Further, in the present invention, instead of the central monitoring center 1 counting the number of discards, the subscriber line terminal device 2 counts the number of discards as shown by a dotted line,
When the number of discards exceeds the threshold Th1 (step S4
0), OAM (Operation Adminis
The connection disconnection warning may be issued to the offending user terminal using a tration & maintenance) cell.

Also in this case, when the subscriber line terminal device 2 detects that the number of discards exceeds another threshold value Th2 which is larger than the threshold value Th1 due to the continuous flow of the violating cell group, Step S50), the subscriber line terminal device 2 notifies the central monitoring center 1 of this, and the central monitoring center 1 controls the subscriber line terminal device 2 to connect the offending user terminal to the ATM network. The actual disconnection of the connection can be performed.

[0021] After cutting the connection as above SL, ATM between the central monitoring center 1 and the user terminal
When the negotiation of the network connection is established via the monitoring control network CNW, the subscriber line terminal device 2 restores the connection between the user terminal and the ATM network .

[0022]

FIG. 2 is a flowchart showing an embodiment of the policing user interface system according to the present invention shown in FIG. 1, and FIG. 3 is a policing user interface system shown in FIG.
Fig. 4 (1) for realizing the user interface method
1 shows an embodiment of the subscriber line terminal unit 2 in the ATM network NW shown in FIG.

In the embodiment shown in FIG. 3, the subscriber line terminal unit 2 includes a flow monitoring unit 20 and a control unit 21 for connecting the flow monitoring unit 20 to the central monitoring center 1 via a monitoring control network CNW. And a warning cell insertion unit 22 for transmitting a warning cell to a user terminal (see FIG. 4) which is controlled by the unit 21.

The flow rate monitoring unit 20 monitors the flow rate of ATM cells from the user terminal, detects a violation group of contract cells, discards the violation cell group, and writes and changes the VPI table. A counting unit 202 that counts the number of times of violating cell discarding; a comparing unit 203 that compares the number of times of violating cell discarding with threshold values Th1 and Th2 (Th1 <Th2); and an interface unit 204 that is a connection unit with the control unit 21 The warning cell insertion unit 22 further includes an interface unit 221 that is a connection unit with the control unit 21 and a warning cell generation unit 222 that generates a warning cell.

In the embodiment shown in FIGS. 2 and 3, the subscriber line terminal equipment 2 performs the counting of the number of times of violating cell discarding and the comparison with the threshold value in the method of the present invention shown in FIG. The same processing can be realized by providing these in the central monitoring center 1 as well.

Next, the embodiment of FIG. 2 will be described with reference to the embodiment shown in FIG. 3. First, the policing unit 201 monitors the amount of ATM cells flowing from the user terminal, and
When the cell amount exceeds the contract amount (see FIG. 4 (2)) (step S1 in FIG. 2), it is determined that the contract has been violated, but the violating cell discard reference amount set to be larger than this contract amount does not exceed. In this state, the violating cells are not discarded.

The AT exceeding the violation cell discard reference amount
When the amount of M cells flows in (Step S2), the policing unit 201 first discards the violating cell group (Step S3) and increments the counting unit 202 each time the violating cell is discarded.

The counting section 202 calculates the counted value,
That is, the number of discards of the offending cell group is sent to the comparing section 203, and the comparing section 203 first compares the discarded number with the threshold value Th1. As a result of this comparison, when the number of discards exceeds the threshold Th1 (step S4).
At 0), since the control unit 21 is notified via the interface unit 204 that the traffic is in a dangerous state with respect to the traffic of the ATM network, the control unit 21 issues a warning cell insertion command to the warning cell insertion unit 22. give.

Thus, the warning cell insertion unit 22 receives the command from the warning cell generation unit 222 via the interface unit 221 and thereby receives the OAM which is a monitoring cell in the apparatus.
A warning of disconnection is given by inserting warning information into the cell (step S41) and sending it to the opposite user terminal (not shown).

As shown by the dotted line in FIG. 2, the control unit 21 sends the violating cell group discard count to the central monitoring center 1 through the monitoring control network CNW (see FIG. 4A) to the threshold Th1.
And the central monitoring center 1 notifies the violating user terminal to the monitoring control network CN.
A connection disconnection warning may be issued through W.

In addition, despite the fact that a connection disconnection warning is issued to the offending user terminal as described above, the number of discards becomes The comparison unit 2 determines that another threshold value Th2 (see FIG. 2B) that is larger than the threshold value Th1 is exceeded.
When 03 is detected (step S50), this is notified to the central monitoring center 1. Then, the central monitoring center 1 issues a connection disconnection notification instead of a warning to the violating user terminal, and via the control unit 21. A command to disconnect the connection is given to the policing unit 201.

The policing unit 201 that has received the connection disconnection instruction changes the VPI table (step S
By performing 6), the connection is disconnected.

After the connection is disconnected as described above, the ATM is connected between the central monitoring center 1 and the user terminal.
Negotiation of network connection (step S7)
Is established via the supervisory control network CNW, the central monitoring center 1 issues a connection restoration command to the subscriber line terminal equipment 2, and receives the policing command from the control unit 21 of the subscriber line terminal equipment 2. The part 201 returns to V
Make changes such as restoring the PI table (step S
8) The user terminal and the ATM network NW
Connection can be restored.

The counting section 202 continues the counting operation even if the number of times of violating cell discard exceeds the threshold Th1, but the number of violating cells is reduced in accordance with the user terminal failure recovery or the notification of disconnection, and the violating cell discarding is performed. When the number of times does not exceed the threshold Th2 within a predetermined time, the counting unit 202
Are reset, and the connection is not disconnected.

[0035]

As described above, the polishing method according to the present invention
According to the user interface system, the amount of ATM cells from a user terminal is monitored by a subscriber line terminal, and
When the cell amount exceeds the contract amount, it is determined that the contract has been violated, but the violating cell group that does not exceed the violation cell discard reference amount set to be larger than the contract amount is not discarded. And the AT
Only when the M cell amount exceeds the violating cell discard reference amount, the subscriber line terminal discards the violating cell group, the number of discards is counted by the central monitoring center or the subscriber line terminal, and the discarding is performed. When the number of times exceeds the threshold value, a connection disconnection warning is issued to the violating user terminal through the monitoring control network.
Since the amount of TM cells is limited, it is possible to eliminate abnormal traffic in the ATM network.

Further, when the number of discards exceeds a larger threshold, a notification of disconnection is given to the user terminal from the central monitoring center, the disconnection is executed in the subscriber line terminal equipment, and the connection is established.
After disconnecting the user terminal, the central monitoring center 1 and the user terminal
Negotiation of ATM network connection between
When established via the visual control network CNW,
The incoming line terminal device 2 is connected to the user terminal and the ATM network.
Connection so to restore the the forcibly disconnect City user terminal from a network of malicious that might disturb the traffic of the network, and negotiate
When established, the connection can be restored , and the quality of service can be protected.

[Brief description of the drawings]

FIG. 1 is a sequence diagram showing the principle of a policing user interface system according to the present invention.

FIG. 2 is a sequence diagram showing an embodiment of a policing user interface system according to the present invention.

FIG. 3 is a block diagram showing an embodiment of a subscriber line terminal device in an ATM network NW which realizes a policing user interface system according to the present invention.

FIG. 4 is a block diagram showing a general configuration example of a conventional ATM network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central monitoring center 2 Subscriber line terminal equipment 20 Flow rate monitoring unit 201 Policing unit 21 Control unit 22 Warning cell insertion unit In the drawings, the same reference numerals indicate the same or corresponding parts.

Continued on the front page (72) Inventor Hiroaki Komine 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Hiroshi Takeo 1015 Uedanaka, Nakahara-ku, Nakahara-ku Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Invention Person Michio Kusanagi 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Naoaki Yamanaka 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Inventor Yoichi Sato Tokyo Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwai-cho, Chiyoda-ku (56) References JP-A-4-168834 (JP, A) JP-A-63-42543 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) H04L 29/14 H04L 12/28

Claims (3)

(57) [Claims] 1. A subscriber line terminal equipment (2) monitors the amount of ATM cells flowing from a user terminal. When the amount of ATM cells exceeds the contract amount, it is determined that the contract has been violated. The violating cell group that does not exceed the larger set violation cell discard reference amount is not discarded, and when the ATM cell amount exceeds the violation cell discard reference amount, the subscriber line terminal device (2) sets the At the same time, the group of violating cells is discarded, and the violating cell discard is notified to the central monitoring center (1) .The central monitoring center (1) counts the number of the discards, and when the number of discards exceeds the threshold, and calling the disconnection warning to the violation user terminal through the monitoring control network, by further said violation cell group continued to flow into
When the number of discards exceeds another threshold larger than the threshold,
The central monitoring center (1) sends a message to the violating user terminal.
A connection disconnection notification is issued and the subscriber line terminal equipment is sent.
(2) to control the offending user terminal and the ATM network.
Disconnects the connection with the
After disconnection, the central monitoring center (1) and the user terminal
Negotiation of ATM network connection between
When established via the supervisory control network,
The user line terminal equipment (2) communicates with the user terminal and the ATM network.
Connection policing user interface system, which was characterized by Rukoto to recover with. 2. The subscriber line terminal equipment (2) counts the number of discards on behalf of the central monitoring center (1), and when the number of discards exceeds the threshold value, the subscriber line terminal equipment (2) An O
The policing user interface system according to claim 1, wherein the connection disconnection warning is issued to the violating user terminal using an AM cell. 3. When the number of discards exceeds another threshold value larger than the threshold value due to the continuous flow of the offending cell group, the subscriber line terminal unit (2) notifies the central office of the fact that the number of discards has exceeded the threshold value. Notify the monitoring center (1) to notify the central monitoring center
3. The policing user interface according to claim 2 , wherein (1) controls the subscriber line terminal device (2) to disconnect the offending user terminal from the ATM network. method.