JP2000209222A - Atm connection re-setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue setup call re-setting processing of permanent virtual channel PVC connection, while preventing congestion of ATM switches. SOLUTION: An ATM switch 11A, receiving an interrupt message, transmits a call setup message to an ATM switch 11B and sets a re-setting execution short period T1 and a re-setting execution long period T2 longer at least than the re-setting execution short period T1 to each PVC connection to start time measurement. When the ATM switch 11A receives an interrupt message again, the ATM switch 11A transmits the call setup message to the ATM switch 11B for each re-setting execution short period T1. The ATM switch 11A transmits the call setup message to the ATM switch 11B for each re-setting execution long period T2, after the first lapse of the re-setting execution long period T2 after the reception of the interrupt massage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PVC (Permanent Virtual Ch
annel) A for performing the call resetting process of the connection
The present invention relates to a TM connection resetting method.

[0002]

2. Description of the Related Art Conventionally, there has been known a method of establishing a fixed connection (PVC connection) called a PVC via an ATM switch on an ATM network in order to exchange data between ATM terminals. When a PVC connection is disconnected due to, for example, a failure in the ATM network, a configuration change, or the like, the ATM switch searches, for example, another detourable route based on the current configuration information of the current ATM network that is stored in advance. Thus, resetting of the PVC connection is automatically performed.

[0003]

In the reconfiguration of the PVC connection as described above, the ATM switch triggers a disconnection message received when the PVC connection is disconnected, for example, by transmitting a call setup message or the like. Perform the resetting process. However, when the resetting of the PVC connection is not successful due to, for example, a line failure or a shortage of a bypass route, the call resetting process is continuously repeated until the resetting is successful. For this reason, for example, in an ATM network in which a large number of PVC connections are set, there is a possibility that the ATM switch itself becomes congested. Further, if the call resetting process performed for each PVC connection is performed at the same time, the ATM switch will fail. Not only that, the entire ATM network may be adversely affected. The present invention has been made in view of the above circumstances, and provides an ATM connection resetting method capable of preventing an ATM switch from being congested when resetting a disconnected PVC connection on an ATM network. With the goal.

[0004]

In order to solve the above-mentioned problems and achieve the object, an AT according to the present invention as defined in claim 1 is provided.
The M connection resetting method is an ATM connection resetting method for performing a call resetting process for a disconnected PVC connection on an ATM network.
Setting a reset execution cycle consisting of a predetermined period of time for each of the disconnected PVC connections upon detecting disconnection of the VC connection;
Repeating the call resetting process in each resetting execution cycle until the resetting of the C connection is successful.

In the above-described ATM connection resetting method, even when the call resetting process of the PVC connection fails, the fixed time interval determined by the resetting execution cycle is maintained without immediately resuming the call resetting process. Since the call re-establishment process is performed in this manner, for example, even in an ATM network in which a large number of PVC connections are set, it is possible to prevent the ATM switch from being congested.

The method of resetting an ATM connection according to claim 2, further comprising the steps of: setting a plurality of time periods different from each other; and detecting the disconnection of the PVC connection, the shortest time period among the time periods. Adopting a cycle as the reset execution cycle;
After detecting disconnection of the VC connection, after the elapse of the time period next to the reset execution period, adopting the time period next to the reset execution period as the reset execution period; It is characterized by including.

In the above ATM connection resetting method, the call resetting process is performed every short time period immediately after the disconnection of the PVC connection is detected, and then the call resetting process is sequentially performed every long time period. , For example, PVC
If the disconnection is temporary, the PV
The call resetting process of the C connection can be completed, and even if the disconnection of the PVC connection is for a long period of time, the call resetting process is not repeated more frequently than necessary. The resetting process can be performed, and congestion of the ATM switch can be further prevented.

[0008] Further, the ATM connection resetting method according to claim 3 provides the ATM connection resetting method according to claim 1 or 2.
An M connection resetting method, wherein one of the number and time of repeating the call resetting process or the number and time of repeating the call resetting process is limited to an appropriate value.

In the above-mentioned ATM connection resetting method, since the number of times and the time of the call resetting process or both of them can be restricted, for example, the disconnection of the PVC connection may take a long time. Over time, when the restoration cannot be expected early, unnecessary call resetting processing can be ended.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ATM connection resetting method according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an ATM according to an embodiment of the present invention.
FIG. 3 is a network configuration diagram for realizing a connection resetting method. As shown in FIG. 1, the ATM network 10 for realizing the ATM connection resetting method according to the present embodiment includes a plurality of, for example, three ATM switches 11A and 11A.
B, 11C. The ATM connection in the present embodiment is, for example, a Soft-PVPC / PVCC
For example, when a maintenance person or the like makes a PVC connection setting request to the ATM switch 11A, the ATM switch 11A uses the signaling procedure to transmit the ATM connection from the ATM switch 11A through the ATM switch 11B. For example, a plurality of PVC connections up to the ATM switch 11C are automatically set.

The ATM network 10 for realizing the ATM connection resetting method according to the present embodiment has the above-described configuration. Next, the operation of the ATM connection resetting method in the ATM network 10 will be described with reference to FIGS. I will explain while. Here, FIG.
FIG. 9 is a sequence diagram showing a part of a signaling sequence when an M connection is reset. First, as shown in FIG. 1, the ATM switch 11B and the ATM switch 11
For example, when a line failure occurs between the ATM switch 11C and the PVC connection set between the ATM switch 11B and the ATM switch 11C, the ATM switch 1
1B transmits a disconnection message to the ATM switch 11A. ATM switch 11 that has received the disconnect message
A recognizes that the PVC connection set between the ATM switch 11B and the ATM switch 11C has been disconnected. Here, the ATM switch 11A uses the disconnection message as a trigger signal to start a call resetting process of the PVC connection by, for example, transmitting a call setting message.

First, the ATM switch 11A sends a call setup message to the ATM switch 11B using a signaling procedure to reset all the PVC connections disconnected between the ATM switch 11B and the ATM switch 11C. Do. At this time, the ATM switch 11A is set to 1
For each PVC connection, a plurality of reset execution short periods T1, for example, two different time periods, and at least a reset execution long period T longer than the reset execution short period T1
2 is set, and time measurement is started by, for example, a timer. The ATM switch 11B, which has received the call setup message from the ATM switch 11A,
Attempts to send a call setup message to C, but due to the failure of ATM switch 11B and ATM switch 11C, AT
If the transmission of the call setting message to the M switch 11C fails, the disconnection message is transmitted to the ATM switch 11A again.

[0013] Again, the ATM switch 11A receiving the disconnection message recognizes that the reconfiguration of the PVC connection between the ATM switch 11B and the ATM switch 11C has failed, but immediately transmits the call setting message. Instead, it waits for the elapse of the reset execution short period T1 from the previous transmission of the call setup message, and at the elapse of the reset execution short period T1, the ATM switch 11
A call setup message is transmitted to B. As described above, the ATM switch 11A keeps resetting every short cycle T1 until the reset of the PVC connection between the ATM switch 11B and the ATM switch 11C succeeds, that is, until the disconnection message is no longer received from the ATM switch 11B. Then, a call setup message is transmitted from the ATM switch 11A to the ATM switch 11B. The transmission of the call setting message for each resetting execution short cycle T1 is repeated until the resetting execution long cycle T2 elapses for the first time.

The ATM switch 11A terminates the transmission of the call setup message for each reset execution short cycle T1 when the reset execution long cycle T2 elapses for the first time after the time measurement is started by, for example, a timer. Thereafter, a call setup message is transmitted from the ATM switch 11A to the ATM switch 11B every reset execution long period T2.

According to the ATM connection resetting method of the present embodiment, even if the call resetting process of the PVC connection fails, the call resetting process is not immediately restarted, and the call resetting process is executed every short period T1 of resetting execution. Since the call resetting process is performed every reset execution long period T2, even in the case of the ATM network 10 in which a large number of PVC connections are set, call resetting of the PVC connections is performed while preventing the ATM switches 11A and 11B from being congested. The setting process can be continued. Further, immediately after the disconnection of the PVC connection is detected, the call resetting process is performed every short period T1 of the resetting execution, and then the call resetting process is performed every long period T2 of the resetting execution. If the disconnection is temporary, the call resetting process of the PVC connection can be completed early, and
Even if the disconnection of the VC connection is long-term,
Since the call resetting process is not repeated more frequently than necessary, an efficient call resetting process can be performed.
It is possible to further prevent the switches 11A and 11B from being congested.

In this embodiment, the ATM switch 11A has a plurality of, for example, two resetting execution short periods T1 having different time periods and at least a resetting execution long period T2 longer than the resetting execution short period T1. Although the setting is described above, the present invention is not limited to this, and only one of the resetting execution short cycle T1 and the resetting execution long cycle T2 may be set. In this case, the transmission of the call setting message from the ATM switch 11A to the ATM switch 11B is always transmitted at a fixed time period. Further, the number of times the call resetting process of the PVC connection is repeated and the time for continuing the call resetting process of the PVC connection may be set to an appropriate value. In this case, it is possible to prevent unnecessary and unnecessary call re-establishment processing from being repeated when, for example, a line failure is not repaired.

[0017]

As described above, according to the ATM connection resetting method of the present invention, the call resetting process is performed at a fixed time interval determined by the resetting execution cycle. , It is possible to continue the call resetting process while preventing the ATM switch from being congested. Further, according to the ATM connection resetting method according to the second aspect, immediately after the disconnection of the PVC connection is detected, the call resetting process is performed every short time period, and thereafter, sequentially.
To perform the call resetting process with a longer time period, for example,
If the disconnection of the PVC connection is temporary, the call re-establishment processing of the PVC connection can be completed early, and even if the disconnection of the PVC connection is for a long period of time, the call is renewed more frequently than necessary. Since the resetting process is not repeated, an efficient call resetting process can be performed. Further, according to the ATM connection resetting method of the third aspect, it is possible to set a limit on both the number of times and the time of the call resetting process, or on either one of the two. Unnecessary call resetting processing can be ended, for example, when disconnection is over a long period of time and the repair cannot be expected early.

[Brief description of the drawings]

FIG. 1 is a network configuration diagram for realizing an ATM connection resetting method according to an embodiment of the present invention.

FIG. 2 is a sequence diagram showing a part of a signaling sequence when an ATM connection is reset.

[Explanation of symbols]

 10 ATM network 11A, 11B, 11C ATM switch T1 Reconfiguration execution short cycle T2 Reconfiguration execution long cycle

Claims (3)

[Claims] 1. An ATM connection resetting method for performing a call resetting process for a disconnected PVC connection on an ATM network, comprising the steps of: Setting a resetting execution cycle consisting of a predetermined fixed time; and repeating the call resetting process for each resetting execution cycle until the resetting of the disconnected PVC connection succeeds. Characteristic ATM connection resetting method. 2. A step of setting a plurality of mutually different time periods; and a step of, when detecting disconnection of the PVC connection, adopting the shortest time period among the time periods as the reset execution period. After detecting the disconnection of the PVC connection, after the elapse of the time period next to the reset execution period,
2. The method according to claim 1, further comprising: adopting, as the reset execution cycle, the time cycle that is longest after the reset execution cycle. 3. The method according to claim 1, wherein one of the number and time of repeating the call resetting process or the number and time of repeating the call resetting process is limited to an appropriate value. Item 3. An ATM connection resetting method according to Item 2.