JPH1023021A - Automatic pvc path change-over method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce work time and work quantity, accompanying PVC path change-over work connecting a PVC path corresponding to a PVC identifier to a shift destination exchange for an identified permanent virtual circuit (PVC) control software entity. SOLUTION: An exchange maintenance staff indicates the PVC path change- over from a newly arranged exchange 4 and indtcates PVCid collection as against another exchange, such as an adjacent tandem switch 2, etc. In another exchange, main PVCid on the PVCid collection indication is compared with PVCid which is collected at the time of setting the PVC path, so as to be stored and the exchange is adapted as a change-over exchange at the time of matching. Then, a main exchange 1 which receives PVCid collection response indicates PVC path change-over with respect to the tandem switch 2 which returns PVCid collection response. The tandem switch 2 automatically change-over the PVC path, so as to permit the PVC path which is set towards the main exchange 1 to be directed to the newly arranged exchange 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connection-oriented PVC (permanent virtual circuit) path control in a switching system, and more particularly, to a new switching system in which a subscriber accommodated in an existing switching system is installed. And the like, and a PVC path automatic switching method suitable for switching a PVC path accompanying the accommodating of a subscriber, and a P set between a calling terminal and a called terminal.
PVC that enables early restoration of a PVC path when a part of the VC path is disconnected due to a failure, thereby minimizing the effect on users who use the PVC service.
It relates to an automatic path switching method.

[0002]

2. Description of the Related Art Conventionally, a connection-oriented PV for fixedly connecting a communication path between a calling terminal and a called terminal.
There are the following two methods for switching the subscriber who receives the C service from one exchange to another exchange. The first method is the most general (primitive) method, in which the exchange maintenance person once disconnects the old PVC path corresponding to the PVC service, and resets a new PVC path from the subscriber's new accommodation exchange. Is the way.

[0003] A second method is a method in which a PVC path is set in advance from the exchange that switches the PVC path to the new accommodating exchange, and the PVC path is switched. For example, in the specification of Japanese Patent Application No. Hei 7-130061, the connection state of a call is stored in advance as call connection information, and the communication is performed based on the call connection information. In the call connection information storage unit of any switching node performing the call, the call connection information before switching, the call connection information after switching, and the operating state and the standby state of these connection information are stored, so that the call during communication is stored. It describes what tried to change the connection destination. On the other hand, as a conventional method for identifying a PVC path in a switching network, a method of providing a PVC identifier that is unique in the switching network is disclosed in Japanese Patent Application No. Hei 7 (1994) -108, filed on Nov. 7, 1997.
No. 49526. According to this method, the PVC path can be uniquely identified by the PVC identifier in any exchange through which the PVC path passes.

[0004]

In general, a switch maintenance person has a large amount of work required for switching a PVC path. Therefore, especially when a large number of subscribers need to be relocated due to station division, etc. A long time is required from the start to the end, and the maintainability of the exchange is reduced. In addition, during such switching maintenance work, the suspension time of the PVC service for the user to be accommodated is increased, and the serviceability is reduced. In the first conventional method described above, in a PVC path switching operation by station division or the like, the exchange maintenance person
The route of the C path must be consciously designated in some form, and the work range in which the maintenance person intervenes is widened, which causes a problem that the work time and work amount increase. Further, according to the first method, once the switching operation is started, the switching operation fails when the switching operation fails due to a failure or when it is necessary to return to the state before the switching operation for other reasons. There is also a problem that the user has to reset the original PVC path.

Further, according to the second method described in the specification of Japanese Patent Application No. Hei 7-130061, there is no description of a method for deciding which exchange is a PVC path switching exchange for performing PVC path switching. If this is performed by an existing method, there is a problem similar to that of the above-described first method. An object of the present invention is to provide a PVC path automatic switching method capable of automatically performing an operation of determining a PVC path switching exchange by an exchange, and reducing a work time and an amount of work involved in the PVC path switching operation, and ,
In the PVC path switching due to a failure factor, by using the same procedure as the PVC path switching for subscriber accommodation replacement, it is possible to eliminate the need to create a new PVC path switching program for failure processing.
It is intended to provide a path automatic switching method.

[0006]

In order to achieve the above object, the present invention provides (A) a PVC identifier for uniquely identifying each PVC path in a switching network which provides a PVC service as connection-oriented communication. When switching subscribers accommodated in one exchange to another exchange,
This is a method of automatically switching a PVC path for supplying a PVC service contracted by a subscriber by controlling a PVC path for each switching unit. A first step (step 102) of instructing a PVC path switch using a maintenance command with a parameter (PVCid) capable of determining the PVC identifier and an exchange (relay exchange 2) that receives the maintenance command, Querying and identifying whether there is a PVC path control software entity holding the PVC identifier determined by said parameter (step 104);
A third step of instructing the PVC path control software entity identified in the second step to switch a PVC path corresponding to the PVC identifier to be connected to the destination switch (new switch 4) ( (Steps 105 to 106) and a fourth step (step 107) of switching the PVC path based on the instruction in the third step (see FIG. 1).

The present invention also provides (B) a PVC identifier for uniquely identifying each PVC path in a switching network that provides PVC service as connection-oriented communication, and separates a subscriber accommodated in a certain exchange from another. A method of automatically switching a PVC path for supplying a PVC service contracted by the subscriber by controlling a PVC path for each exchange when the accommodation is switched to another exchange. A first step (step 401) of notifying the exchange accommodating the transmitting terminal or the receiving terminal of information of the failed PVC path when a failure occurs in a part of the PVC path set during the period. A second step (step 405) of transmitting a PVC path switching instruction from the exchange notified in the first step (step 405); It is characterized by having a third step of switching the PVC path (step 406) based on the instruction that (see FIG. 5).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a PVC identifier for uniquely identifying a PVC path in a switching network, and receives a maintenance command for switching from a switching center (main switching center) to another switching center (such as a relay switching center). Is inquired as to whether or not a specific PVC identifier is stored, and the software entity on the other exchange identified as being stored by the inquiry is instructed to switch the path. Further, a PVC path switching instruction is activated when a PVC path failure occurs.
In the present invention, the PVC identifier is used by utilizing the PVC identifier.
Path switching can be performed automatically.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a diagram showing an example of a PVC path switching processing sequence at the time of station division in one embodiment of the present invention, and FIG. 2 is information (PVC identifier) stored in each exchange at the time of station division in one embodiment of the present invention. ),
FIG. 3 is a diagram showing information elements for configuring a PVC identifier used in the present embodiment. FIG. 4 is a diagram showing an example of a processing sequence when setting a PVC path in one embodiment of the present invention.
FIG. 8 is a diagram showing an example of a PVC path switching sequence at the time of failure in one embodiment of the present invention.

Various types of PVC identifiers can be used as long as they are unique within the exchange network. In this embodiment, the route information shown in FIG. 3 (specific information as to which exchange the PVC path is used to connect to the receiving terminal, hereinafter referred to as PVCid)
To construct a PVC identifier. In FIG. 3, a service type 201 is a field for indicating a service type, and there is “PVC” as a currently available value. The PVC path setting type 202 is a field indicating a path setting opportunity, and is currently unused because there is only a path setting instruction (see step 301) by a switch maintenance person as shown in FIG. PVC
The number 203 is a unique number within one exchange and is used to specify a PVC within one exchange. PVC
The path setting exchange number 204 is a unique number in the exchange network, and specifies one exchange in the exchange network. PV with specific values in each of these fields
When a PVC identifier is configured by linking Cids (see information 31 to 33 in FIG. 4 described later), two P
When the VC identifier has the same PVCid, two PVs
The PVC paths identified by the C identifier can be said to be the same.

FIG. 4 shows a PVC according to an embodiment of the present invention.
It is a processing sequence example at the time of path setting. In FIG.
Reference numeral 1 denotes a main exchange accommodating a calling path subscriber, and an exchange maintenance person issues a PVC path setting instruction to the main exchange 1 to set a PVC path. Reference numeral 2 denotes a relay exchange that relays data to an exchange accommodating the PVC receiving subscriber. Reference numeral 3 denotes a slave exchange in which a PVC terminating subscriber is accommodated. The exchange maintenance person issues a PVC path setting instruction from the main exchange 1 to the relay exchange 2 (step 301).
At this time, the main switching device 1 transfers the PVCid of the main switching device 1 with the PVC path setting instruction given to the relay switching device 2 (step 302). In the transit exchange 2, the PVCid of the main exchange 1 and the PVCid of the own exchange 2 transferred from the main exchange 1 are stored as information 32 in the own exchange 2 (step 303). The PVCid is transferred with the PVC path setting instruction instructed by the main exchange 1 (step 304).

In the slave exchange 3, as in the transit exchange 2,
The PVCid of the main exchange 1 transferred from the main exchange 1;
The PVCid of the local exchange 3 is stored as information 33 in the local exchange 3 (step 305).
A response to the PVC path setting instruction is returned. At this time, PVC
The response to the path setting instruction carries the PVCid of the slave exchange 3 and transfers it (step 306). PV from slave exchange 3
The transit exchange 2 that has received the response to the C path setting instruction returns the PVCid of the transit exchange 2 to the main exchange 1 in addition to the response to the PVC path setting instruction (step 307). The main exchange 1 that has received the response to the PVC path setting instruction becomes the transit exchange 2
And the PVCid of the local exchange 3 and the PVCi of the local exchange 1
d is stored as information 31 in the local exchange (step 3
08). By performing the above processing, the main exchange 1 in which the calling terminal is accommodated, the slave exchange 3 in which the called terminal is accommodated,
In addition, information (PVC identifier) composed of the PVCids of the local exchange and the other exchanges is accumulated in each of the relay exchanges 2 for relay.

FIG. 1 shows an example of a PVC path switching processing sequence at the time of division of a station by a newly installed exchange according to an embodiment of the present invention, and FIG. 2 shows information (PVC identifier) stored in each exchange. In FIG. 1, reference numerals 1, 2, and 3 denote a main exchange, a transit exchange, and a slave exchange, respectively, as in FIG. Reference numeral 4 denotes a new exchange to which a user accommodated in the main exchange 1 is exchanged. Further, 130 is a subscriber (terminal) before switching on the transmitting side, 131 is a subscriber (terminal) after switching on the transmitting side, and 132 is a subscriber (terminal) on the receiving side. In the new exchange 4, when the PVC path is set, the PVCs of the relay exchange 2 and the slave exchange 3 collected and stored by the main exchange 1 are stored.
A PVC identifier 11 (see FIG. 2) consisting of an ID is relocated and provided in advance (step 101).

Next, when the exchange maintenance person issues a PVC path switching instruction from the new exchange 4 (step 102), the new exchange 4 issues a PVCid collection instruction to the other exchanges such as the adjacent relay exchange 2 (step 102). 103). In other exchanges (ie, the relay exchange 2 and the like), this PV
The main PVCid included in the Cid collection instruction is compared with the PVCid collected and accumulated at the time of setting the PVC path (step 104).

As a result of the comparison in step 104, PVC
If there is a match between the main PVCid indicated in the id collection instruction and the PVCid collected and accumulated at the time of setting the PVC path, the exchange is set as a switching exchange. As a result of the comparison in step 104, if they do not match, the comparison is continued with other exchanges such as the main exchange 1 and the slave exchange 3 until they match. Here, it is assumed that they match in the transit exchange 2. In this case, the matching transit exchange 2 is determined to be the switching exchange, and this transit exchange 2 sends its own P
The VCid is loaded as a relay PVCid and returned to the main exchange 1 (step 105).

Main exchange 1 that has received the PVCid collection response
Issues a PVC path switching instruction to the transit exchange 2 that has returned the PVCid collection response (step 106). PV
In the transit exchange 2 receiving the C path switching instruction, the main exchange 1
Path automatic switching is performed so that the PVC path set for the new switch 4 is directed to the newly installed exchange 4 (step 10).
7). Further, in the transit exchange 2, the PVC of the new main exchange (newly installed exchange) 4 described in the PVC path switching instruction is used.
ID and the new PVCid of the local exchange, the information 12 in the local exchange.
(See FIG. 2) and accumulate (step 108).
The new switching device 4 with the new relay PVCid on the path switching response
(Step 109). Upon receiving the PVC path switching response, the newly installed exchange 4 extracts the new relay PVCid from the PVC path switching response and stores the new relay PVCid and the new PVCid of the own exchange 1 as information 14 (see FIG. 2) in the own exchange 4 (see FIG. 2). Step 110).

As described above, according to this embodiment, P
By using VCid, a PVC path switching process can be automatically performed at the time of station division by the newly installed exchange.
After the PVC path is automatically switched, the main exchange 1 has information (14 in FIG. 2) of the new main exchange PVCid, the new intermediate exchange PVCid, and the subordinate exchange PVCid, and the intermediate exchange 2 has the new intermediate exchange PVCid, New main exchange PVCid
(12 in FIG. 2) is transmitted to the slave exchange 3 by the slave exchange PV.
Cid and information of the main exchange PVCid are stored (1 in FIG. 2).
3) Has been done.

FIG. 5 is a diagram showing one embodiment of a PVC path automatic switching sequence when a failure occurs in a transit exchange. In FIG. 5, 1, 2, and 3 are a main exchange, a transit exchange, and a slave exchange, respectively, as in FIG. In this embodiment, it is assumed that the exchange in which the failure of the PVC path has occurred is the transit exchange 2. The transit exchange 2 that has detected the failure sends the PV
The P of the relay exchange accumulated in the local exchange 2 when the C path is set
The VCid (relay PVCid) is taken out, the relay PVCid is mounted on the main exchange 1, and a failure notification of the PVC path is performed (step 401). Upon receiving the failure notification, the main exchange 1 determines from the transferred PVC path failure notification
The VCid is taken out (step 402), and the exchange maintenance person is notified (maintenance person notification) that the PVC path of the intermediate exchange has been disconnected due to a failure (step 40).
3).

Upon receiving a maintenance person's message from the main exchange 1, the exchange maintenance person takes out the PVCid of the transit exchange 2 accumulated in the own exchange 1 when the PVC path is set for the main exchange 1, and sends the PVCid to the transit exchange 2 for the PVC. A path switching instruction is issued (steps 404 and 405). The transit exchange 2 that has received the PVC path switching instruction from the main exchange 1 automatically switches from the failed old PVC path to the new PVC path (step 406), and further transfers the new transit PVCid to the information in its own exchange 2. 42 as well as (step 40
7), the new relay PVCid is transferred to the main exchange 1 with the PVC path switching completion notification (step 408). The main exchange 1 that has received the PVC path switching end notification from the relay exchange 2 extracts the new relay PVCid from the PVC path switching end notification and stores it as information 41 in the local exchange 1 (step 409). As described above, according to the present embodiment, by using the PVCid, the relay exchange 2 in which the failure has occurred can replace the old PVC path in which the failure occurred with the new PVC path.
It is automatically switched to the path. After the PVC path is automatically switched, the main exchange 1 stores information (4) of the main exchange PVCid, the new transit exchange PVCid, and the subordinate exchange PVCid.
1), the relay exchange 2 has information (42) on the new relay exchange PVCid and the main exchange PVCid, and the slave exchange 3 has information (43) on the slave exchange PVCid and the main exchange PVCid.
Has been accumulated.

In the above description, when a failure occurs in a part of the PVC path (the PVC path in the transit exchange), the disconnection point is notified to the exchange (main exchange 1) accommodating the calling terminal. (Step 40
1), the exchange accommodating the terminating terminal may be notified. In this case, the PVC path can be automatically switched in the same sequence as in FIG. 5 simply by switching the main exchange and the slave exchange.

[0021]

As described above, according to the present invention,
Using the PVC identifier of the PVC path accumulated in the main exchange, when switching the PVC path due to station division and failure,
The switching switch can be determined autonomously without the intervention of a maintenance person, and automatic switching of the PVC path becomes possible.
The working time for the switching work of the C path and the work amount of the exchange maintenance person can be greatly reduced. Further, it is not necessary to create a new PVC path switching program for failure processing.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a PVC path switching sequence at the time of station division in one embodiment of the present invention.

FIG. 2 is a diagram showing an example of information (PVC identifier) stored in each exchange at the time of station division in one embodiment of the present invention.

FIG. 3 is a diagram showing components for configuring a PVC identifier in one embodiment of the present invention.

FIG. 4 is a diagram showing an example of a processing sequence at the time of setting a PVC path in an embodiment of the present invention.

FIG. 5 is a diagram showing an example of a PVC path switching processing sequence at the time of failure according to an embodiment of the present invention.

[Explanation of symbols]

1: Primary exchange 2: Transit exchange 3: Secondary exchange 4: New exchange 201: Service type 202: PVC path setting type 203: PVC number specifying the PVC in the exchange 204: Identifying one exchange in the exchange network PVC path setting exchange numbers 11, 31, 41: Information in the main exchange 12, 32, 42: Information in the transit exchange (PVCid) 13, 33, 43: Information in the secondary exchange (PVCid) 14: In the new exchange Information (PVCid) 130: Subscriber before switching on calling side 131: Subscriber after switching on calling side 132: Subscriber on receiving side

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiro Nishizono 192-1 Nishishinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Inventor Uno ▲ Yu ▼ Person 216 Hitachi, Ltd.Information and Communication Division, Hitachi, Ltd. (72) Inventor Hiroaki Moriyama 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Ltd.Information and Communication Division, Hitachi, Ltd. 216 Totsukacho In the Information and Communication Division, Hitachi, Ltd.

Claims (2)

[Claims] 1. A switching system which has a PVC identifier for uniquely identifying each PVC path in a switching network which provides a PVC service as connection-oriented communication, and switches a subscriber accommodated in one exchange to another exchange. A method of automatically switching a PVC path for supplying a PVC service contracted by the subscriber by controlling a PVC path for each exchange unit. P using a maintenance command with a parameter whose identifier can be determined
A first step of instructing VC path switching, and inquiring by the exchange receiving the maintenance command whether or not another exchange has a PVC path control software entity holding the PVC identifier determined by the parameter. A second step of identifying this, and instructing the PVC path control software entity identified in the second step to switch the PVC path corresponding to the PVC identifier to be connected to the destination exchange. An automatic PVC path switching method, comprising: a third step; and a fourth step of switching a PVC path based on an instruction in the third step. 2. A switching network having a PVC identifier for uniquely identifying each PVC path in a switching network for providing a PVC service as connection-oriented communication, wherein a subscriber accommodated in one exchange is exchanged with another exchange. A method of automatically switching a PVC path for supplying a PVC service contracted by the subscriber by controlling the PVC path for each exchange unit, wherein a PVC path set between a calling terminal and a called terminal is provided. A first step of notifying a switch accommodating the transmitting terminal or the receiving terminal of information of a failed PVC path when a failure occurs in a part of the switch, and an exchange receiving the notification in the first step Sends a PVC path switching instruction from the second
And a third step of switching the PVC path based on the instruction in the second step.