KR20040022907A - System for managing asynchronous transfer mode network and method thereof - Google Patents

Abstract

PURPOSE: A system for managing an ATM(Asynchronous Transfer Mode) communication network and a method therefor are provided to automatically recover fault by automatically securing a main path and an alternative path necessary for composing a new soft-PVC(Permanent Virtual Connection) in a soft-PVC service. CONSTITUTION: A soft-PVC generating unit(110) composes an ATM communication network service according to the service subscription of a subscriber. A path management unit(120) automatically generates and secures a virtual path for the new composition of the ATM communication network service according to the request of the soft-PVC generating unit(110) by a routing algorithm, and transmits information about the secured virtual path to the soft-PVC generating unit(110). A switch control unit(140) manages and controls the soft-PVC generating unit(110) and the path management unit(120), and controls a switch of an ATM communication network so that the switch newly composes the ATM communication network service with respect to the secured virtual path.

Description

Atm communication network management system and method thereof

The present invention relates to an ATM network management system and a method thereof, and more particularly, to automatically obtain a main path and a bypass path required for the construction of a new soft-PVC in a soft-PVC (Permanent Virtual Connection) service and to automatically troubleshoot a failure. The present invention relates to an ATM network management system for recovering and a method thereof.

An Asynchronous Transfer Mode (ATM) network is an information transfer service and provides a PVC service, a switched virtual connection (SVC) service, and a soft-PVC service.

The PVC service is a service that provides end-to-end connectivity for the duration of the subscriber's subscription. PVC is set by ATM-NMS (Asynchronous Transfer Mode-Network Management System) and the route is fixed.

The SVC service provides an end-to-end connection only when the subscriber uses the service. The SVC service is disconnected while the service is not in use, and the SVC is automatically created / released by the signaling protocol of the ATM exchange.

Soft-PVC service, as shown in Figure 1, between the subscriber (20a, 20b) and the ATM communication network PVC (30a, 30b), and in the ATM communication network using the SVC 40 between the end (S, D) A service that provides a connection, like a PVC service, that provides a continuous connection for the life of the subscription.

Soft-PVC service is new because the SVC 40 between the end (S, D) is automatically configured by the signaling protocol inside the ATM network when the ATM-NMS 10 designates both end points (S, D) of the service connection. The subscriber is easy to accept and the ATM-NMS 10 does not have to manage the path of the SVC 40 as a database.

In order to configure the SVC 40, a signaling protocol for the SVC 40 must be activated in the ATM communication network, and a VP (Virtual Path) 50 providing a connection path between the ends S and D must be configured.

The VP 50 refers to a link of an ATM layer configured to actually service the SVC 40 in a physical communication network composed of the switches 60a to 60e and the physical link 70.

VP 50 is divided into VP for PVC and VP for SVC, and Soft-PVC is configured using VP for SVC.

VPs for SVCs differ in nature depending on the type of signaling protocol used between ATM exchanges.

The inter-station signaling protocols of ATM networks are two: Broadband Integrated Service Digital Network (B-ISUP) recommended by ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) and Private Network to Network Interface (PNNI) recommended by ATM Forum. There is a branch.

B-ISUP is a fixed-routing protocol mainly used for large-scale networks. The SVC's end-to-end paths are pre-assigned to each exchange, bypass routes are also specified, and routing is usually specified for installation / relocation of networks. Each time it is designed by a professional technician and entered into the exchange, a VP is formed in the process.

PNNI is a protocol that applies the routing algorithm used in routers. Each exchange exchanges the necessary information to find the optimal path between both ends, so that each VP provides the path for the connection between each end. Decide

In both cases, the basic VP configuration is achieved when the network is installed / relocated.

However, there is a need to configure a new VP or adjust the bandwidth of an existing VP in processing subscriber subscriptions.

When the Soft-PVC service is in a situation where normal service is impossible due to a failure of the physical link 70, the service automatically releases the existing SVC 40 and finds a proper bypass path 80 to configure a new SVC without interruption. Providing a service is an advantage.

However, if the ATM switch does not find an appropriate bypass path because there are no paths that can be bypassed, the paths are all faulty, or if there is a lack of available bandwidth, even if there are paths, the ATM exchange stops the procedure of configuring a new SVC. After sending the alert signal to the ATM-NMS, it becomes out of service.

If the service is interrupted in this way, even if the failure is cleared or a bypass is secured, the ATM switch does not recover the service by itself, and it must be restored to normal state only when the network operator commands the ATM switch through ATM-NMS to reset the service. There is such a problem.

In order to solve the above problems, an object of the present invention is to automatically configure the SVC path required in the Soft-PVC service.

Another object of the present invention is to automatically recover when a service is not available in a Soft-PVC service.

1 is a configuration diagram of a Soft-PVC service of a general ATM communication network.

2 is a block diagram of an ATM communication network management system according to the present invention.

3 is a flowchart of a method of configuring a new Soft-PVC according to the present invention;

4 is a flowchart of a method for recovering a Soft-PVC service failure in accordance with the present invention.

To this end, the ATM network management system according to the present invention,

A service configuration unit for configuring an ATM communication network service according to a subscriber's service subscription; A path manager configured to automatically generate and secure a virtual path for a new configuration of a service by using a routing algorithm according to a request of the service component, and to transfer information about the virtual path secured to the service component; And a control unit configured to manage and control the service configuration unit and the path management unit, and to control the switch of the ATM communication network to configure the new configuration of the service configuration unit for the secured virtual path, thereby newly configuring the ATM communication network service.

An alarm receiver configured to receive a failure occurrence alarm of the ATM communication network; A path manager for searching for a bypass path of a virtual path affected by a failure; A failure recovery unit for requesting adjustment of a virtual path to a path manager in response to a request of an alarm receiver; And a controller configured to manage and control the alarm receiver, the path manager, and the failure recovery unit, and increase the bandwidth of the detour path at the request of the path manager, thereby automatically recovering from the failure.

And, the ATM communication network management method according to the present invention,

A method of configuring and managing an ATM communication network service, the method comprising: a first process of requesting to secure a virtual path for configuring a service when both terminal terminals of a service are input; A second step of determining whether a virtual path for service configuration exists by searching for the remaining virtual path according to the request; Determining, when the virtual path does not exist, determining an optimal virtual path between both surviving terminals; And a fourth process of configuring a service using an optimal virtual path,

CLAIMS 1. A method for managing a failure of an ATM network service, comprising: a first step of requesting adjustment of a failed virtual path upon receiving an alert for the failure; A second step of searching for an extra virtual path that can replace a failed virtual path according to a request; And a third process of increasing the bandwidth and releasing the fault by selecting an optimal virtual path among the redundant virtual paths when the redundant virtual path exists.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of an ATM communication network management system according to the present invention. The Soft-PVC generation unit 110, the path management unit 120, the failure recovery unit 130, the switch control unit 140, and the alert receiving unit 150 are described. Equipped.

The soft-PVC generating unit 110 is a service component, and configures, changes, releases, pauses, and revives the Soft-PVC according to the service subscription of the subscriber.

The alarm receiver 150 receives various alarms generated from the ATM switch and delivers them to the operator.

The exchange control unit 140 collects various operation information such as traffic information from the ATM exchange, and stores communication network equipment (exchange, link, etc.) information, Soft-PVC configuration information, alarm history, and operation information in a database (not shown). To manage.

The path manager 120 determines / creates a VP for path configuration of the new Soft-PVC, or checks the existence of a bypass path for the Soft-PVC which has failed due to a request of the failure recovery unit 130 to determine the relevant VP. It increases the bandwidth.

When the failure recovery unit 130 receives the alarm occurrence notification of the alarm receiver 150, the failure recovery unit 130 requests the path management unit 120 to adjust the path of the corresponding Soft-PVC, and when the notification is received from the path management unit 120, the corresponding exchange is completed. The control unit 140 resets the Soft-PVC to return the ATM switch to the normal state.

In addition, the path management unit 120 and the failure recovery unit 130 of these components may be separated into a separate system and implemented to perform the above functions together with the ATM communication network management system.

Hereinafter, a configuration method of the new Soft-PVC by the above components will be described with reference to FIG. 3.

Upon receiving the subscription for the new Soft-PVC service from the subscriber, the operator first inputs both end exchangers of the ATM communication network connected to the subscriber station to configure the Soft-PVC so that the Soft-PVC configuration is performed (S210).

Then, the soft-PVC generation unit 110 requests the path management unit 120 to secure the path of the soft-PVC for the soft-PVC configuration (S220).

The path manager 120 searches for a VP in the database (S230) and determines whether an appropriate main path and a bypass path exist (S240).

In the B-ISUP communication network, since the main path and the bypass path of each ATM switch are designated in advance, it is possible to easily determine the status of the main path and the bypass path of each Soft-PVC only by searching the database.

However, in the PNNI-applied communication network, it is difficult to pinpoint the main route and the bypass route because the ATM switch selects the route according to the situation at that time, so it is determined by using the automatic routing algorithm together.

As a result, if the main path and the bypass path exist, the Soft-PVC generating unit 110 constructs a new Soft-PVC using the existing main path and the bypass path, and causes the exchange control unit 140 to soften each ATM switch. Control to configure the PVC so that the Soft-PVC service is provided to the subscriber (S270).

However, if the primary path and the bypass path do not exist, one or two optimal paths (the primary path and the bypass path) are determined by applying an automatic routing algorithm between both ends of the corresponding Soft-PVC (S250).

When the new path is determined, the path manager 120 instructs the switch controller 140 to configure a new VP (S260).

When the new VP is configured and the path is secured, the Soft-PVC generating unit 110 configures the new Soft-PVC by using the secured new VP and causes the exchange control unit 140 to configure each ATM exchanger in the Soft-PVC. The control is made to provide the subscriber with the Soft-PVC service (S270).

4 is a flowchart illustrating a method for recovering a Soft-PVC service failure in an ATM network management system according to the present invention.

When the alarm receiver 150 receives a failure alert from the ATM switch, the alert receiver 150 transmits the failure alert to the failure recovery unit 130 (S310).

When the failure recovery unit 130 requests the path management unit 120 to adjust the failed path (S320), the path management unit 120 searches for possible paths for the corresponding Soft-PVC in the database (S330).

At this time, the path search of the path management unit 120 to adjust the path when a failure occurs is different from the path search process (S230) of the new soft-PVC configuration method of FIG. 3 considering the failure status of the physical link where the VP exists. Is that.

In other words, since the VP on the failed physical link is an unusable path, the bandwidth increase is insignificant for such VP, so it is excluded from the routing algorithm.

If there is no path available on the physical link in which the path has not been detected by the path (S340), the operator alerts without generating any further action (S350).

This can be done by constructing a new VP, but in this case of multiple failures, it is more desirable for the operator to directly intervene.

However, if there is a path available in the physical link in which the failure does not occur (S340), an optimal path is selected among them (S360), and the switch controller 140 is instructed to increase the VP bandwidth (S370).

When the adjustment of the VP bandwidth of the switch controller 140 is completed, the failure recovery unit 130 causes the switch controller 140 to reset the corresponding Soft-PVC so that the ATM switch returns to the normal state (S380).

As described above, the present invention is applied to the operation management of the Soft-PVC service of the ATM communication network to automatically secure the main path and the bypass path when configuring the new Soft-PVC, and to automatically take action and recover when a Soft-PVC failure occurs. Therefore, the service quality is improved and the convenience of the operator is increased.

Claims (7)

A service configuration unit for configuring an ATM communication network service according to a subscriber's service subscription; A path manager configured to automatically generate and secure a virtual path for a new configuration of the service by using a routing algorithm in response to a request of the service component, and to transfer information about the secured virtual path to the service component; And And a control unit for controlling and controlling the service configuration unit and the path management unit, and controlling the switch of the ATM communication network to configure a new configuration of the service configuration unit for the secured virtual path. An alarm receiver configured to receive a failure occurrence alarm of the ATM communication network; A path manager for searching for a bypass path of the virtual path affected by the failure; A failure recovery unit for requesting adjustment of the virtual path to the path manager according to the request of the alarm receiver; And ATM control network management characterized in that it comprises a control unit for controlling the alarm recovery unit, the path management unit and the failure recovery unit, and controls the recovery of the failure by increasing the bandwidth of the bypass path in response to a request of the path management unit; system. In the method for configuring and managing ATM network services, Requesting to secure a virtual path for configuring the service when both end terminals of the service are input; A second step of determining whether a virtual path for configuring the service exists by searching for a remaining virtual path according to the request; Determining, when the virtual path does not exist, determining an optimal virtual path between the two surviving terminals; And And a fourth process of configuring the service using the optimal virtual path. The method of claim 3, wherein And a fifth step of configuring the service using the existing virtual path if the virtual path exists as the determination result in the second step. The method of claim 3, wherein In the third process, the optimal virtual path is determined using a routing algorithm. In the method of managing a failure of an ATM network service, Receiving a warning about the failure, requesting adjustment of the virtual path in which the failure occurs; A second step of searching for an extra virtual path that can replace the failed virtual path according to the request; And And a third step of increasing the bandwidth and releasing the fault by selecting an optimal virtual path among the redundant virtual paths when the redundant virtual path exists as a result of the search. The method of claim 6, In the third process, the optimal virtual path is determined using a routing algorithm.