JPH10229402A - Connection release method for access system device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release the connection data via an access system device, without the use of a connection release program by sending the connection data on the access system device to be stored in a secondary storage medium via an exchange, when the notification of initialization of the access device is received by the exchange. SOLUTION: When an ATM access system device 1 has a failure and is initialized with of all the communication paths cut, the device 1 sends an initialization notification signal to an ATM exchange 6 after the completion of the initialization. Having received the initialization notification signal, the exchange 6 selects a subscriber line corresponding part translation table and a subscriber concentration line corresponding part translation table out of the connection data 13 stored in a secondary storage medium for the device 1, based on an ATM access system device translation table. Then the data 13 are sent and released to the device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily restoring a communication path by coordinating an exchange and an access apparatus when an access apparatus encounters a failure and is initialized and all communication paths are disconnected. It is about.

In this type of conventional technology, connection data at the time of setting a connection is held on a secondary storage medium provided in each switching facility, and when the switching facility encounters a failure, all communication paths are lost. When the connection is disconnected, the switching equipment is initialized and restored to a state in which service can be provided.After that, the connection data on the secondary storage medium is loaded onto the main memory, and the connection is established based on the connection data. Recovery processing was being performed. When such a recovery process is performed, the connection recovery process is performed using a connection recovery process program created separately from the connection setting process program.

The details of the connection setting process in this case are described in, for example, Tetsuya Oishi et al., "A Study on ATM Access System Configuration Method", IEICE Technical Report, SSE98-43 (1996.8). That is, according to the description on page 2, line 2, lines 18 to 22, the SN that has received the SETUP message from the user is:
The B-AN sends an ALLOCATION message to the B-AN, and upon receiving this, the B-AN sets the path and sends a completion notification to the SN.
It is said to send an ALLOCATION COMP message.
Here, SN has the same meaning as an exchange, and B-AN has the same meaning as an access device.

[0004] In such a conventional technique, the position of an access system device is such that a connection set in the access system device is always set via a higher-level exchange, and the access system device sets or releases a connection. The feature is that only simple functions such as functions are provided to reduce costs. If the conventional concept is applied to the recovery processing when such an access device encounters a failure, connection data is stored on the secondary storage medium of the access device and a connection different from the connection setting processing program described above. There is a problem that it is extremely inefficient in that a recovery processing program must be created and the processing must be performed by this.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to solve the above-mentioned problems in the prior art, and to realize a connection restoration process in an access system which can be executed with simpler processing than in the prior art. It is to provide a method.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a communication system in which a plurality of subscriber terminals are connected via one or a plurality of access devices, and an end-to-end connection between the subscriber terminals is set or released. The connection data is transmitted from the exchange to the access equipment according to a signal procedure between the exchange and the access equipment, and the access equipment conducts or releases the communication path from the subscriber terminal to the exchange based on the connection data. In a switching network having a function of setting or releasing a connection for connection, in a connection restoration method in an access device when an access device encounters a failure, the switch stores connection data on a secondary storage medium of the switch itself. If the access device encounters a failure and is initialized and all communication paths are disconnected, The access device transmits an initial setting notification signal to the exchange, and upon receiving the initial setting notification signal, the exchange reconnects the connection data stored on the secondary storage medium to the access device again by a signal procedure. By transmitting and setting the connection set before the occurrence of the failure based on the connection data, the access system device restores the communication path from the plurality of subscriber terminals to the exchange to the state before the failure. This is achieved by the connection restoration method in the access device described above.

When a failure that requires initialization of the entire device occurs in the access device, initialization is performed using the system initialization file held on the secondary storage medium by the access device and the system is initialized. A method of setting the call state to a state in which there is no call has been conventionally known (for example, see Minoru Akiyama et al., "Digital Telephone Exchange" (Sangyo Tosho)). In this case, subsequently, it is necessary to restore the communication path disconnected by the initial setting to the state before the occurrence of the failure.

According to the present invention, in this case, after the initialization, the access device transmits an initialization notification signal to the exchange to which the access device is connected, requests the restoration of the connection, and receives the exchange. Received the connection data by selecting the connection data of the access device from the connection data held on the secondary storage medium and transmitting the connection data according to a signal procedure when setting a connection to the access device. The access device recovers the connection through the connection setting process.

Therefore, the method of the present invention provides a connection for restoring a communication path to a state before the failure even when the access system is initialized upon encountering a failure and all communication paths are disconnected. There is an advantage that the restoration process can be performed by the connection setting process.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the embodiment described below, the ATM
A description will be given of an example of connection recovery processing of an ATM access system device in a switching network. However, the present invention should not be limited to an ATM switching network, but rather an STM circuit switching network,
Of course, the present invention can be applied to other switching networks such as a packet switching network.

FIG. 1 is a diagram showing a form of an ATM network when an ATM access system is introduced. In the figure, 1, 2, 3, 4 and 5 are ATM access devices, 6
Is an ATM switch to which the ATM access devices 1, 2 and 3 are connected, 7 is an ATM switch to which the ATM access devices 4 and 5 are connected, and A1 and A2 are subscriptions accommodated in the ATM access device 1. Terminal, B1 and B2 are AT
The subscriber terminals accommodated in the M access system 2, C 1 and C 2 are subscriber terminals accommodated in the ATM access system 3, and D 1, D 2 and D 3 are subscribers accommodated in the ATM access system 4 The terminal E is a subscriber terminal accommodated in the ATM access system 5.

FIG. 2 is a functional block diagram of the ATM access system 1 shown in FIG. In the figure, 8 is a subscriber
A subscriber line corresponding unit in the ATM access system 1 accommodating A1; 9 is an ATM access system 1 accommodating the subscriber A2.
An internal subscriber line unit, 10 is a switch inside the ATM access system 1, 11 is a subscriber line unit inside the ATM access system 1, 12 is a secondary storage medium inside the ATM switch 6, and 13 is a secondary storage medium. This is data for restoring the connections of the ATM access devices 1, 2, and 3 connected to the ATM exchange 6 in the next storage medium 12.

FIG. 3 is a block diagram showing a detailed configuration of the subscriber line corresponding unit 8 and the subscriber line connecting unit 11 shown in FIG. In the figure, 8a and 11a are cell header conversion units.

FIG. 4 is a diagram showing a detailed configuration of the connection data 13 stored in the secondary storage medium 12 shown in FIG. In the figure, reference numeral 13a denotes an AT corresponding to the ATM access devices 1, 2, and 3 connected to the ATM switch 6.
M access system translation table, 13b is a subscriber line translation table in the ATM access system derived from the ATM access system translation table 13a, and 13c is an ATM access system derived in the ATM access system translation table 13a. The translation table 13d of the subscriber line concentrator corresponding to the subscriber line, the data before cell header conversion (VPI value, VCI value) and the data after the cell header conversion (VPI value, VCI value) for each subscriber to be set in the subscriber line corresponding unit, 13e Are data before cell header conversion (VPI value, VCI value) and data after cell header conversion (VPI value, VCI value) for each subscriber to be set in the subscriber line connection section.

The data (VPI value, VC) before the cell header conversion of the cell header conversion unit inside the subscriber line corresponding units 8 and 9 and the cell header conversion unit of the subscriber line connection unit 11 are stored.
I value) and data after cell header conversion (VPI value, VCI
Value) corresponds to the connection data stored in the secondary storage medium 12 of the higher-level ATM switch 6 in the connection recovery method of the present invention.

In the connection set in the ATM access system 1, the subscriber and the ATM access system 1
Of the virtual path identifier (VPI) and the virtual connection identifier (VCI) between the ATM access system devices 1 and A
VPI and VCI values with the TM exchange 6, and A
The VPI value and the VCI value inside the TM exchange 6 are separately given. In order to execute this, the VPI before cell header conversion is added to the cell header conversion units 8a and 11a.
Values and VCI values, and the VPI value and VCI value after cell header conversion are set, respectively, and the VPI value and VCI value that a specific connection should use in the subscriber line corresponding units 8 and 9 and the subscriber line connecting unit 11 Are associated with VPI values and VCI values to be used.

In the switching network configured as described above,
ATM cells are sent as follows. Subscriber terminal A1
The ATM cell transmitted by the cell reaches the cell header converter 8a. The cell header conversion unit 8a converts the VPI value and VCI value arrived from the subscriber terminal A1 into the VPI value and VCI value to be used by the subscriber line connection unit 11, writes the converted values into ATM cells, and receives the received ATM switches. ATM cell VP
Routing is performed based on the I value and the VCI value, and the ATM cell is transmitted to the subscriber line connection unit 11. The cell header conversion unit 11a converts the VPI value and VCI value of the ATM cell arriving from the ATM switch 10 into the VPI value and VCI value to be used in the ATM exchange 6, writes the ATM cell, and writes this cell to the ATM exchange 6. Send.

The operation of the embodiment configured as described above will be described below with reference to the flowcharts of FIGS. 5 and 6 in addition to the above-described drawings. When connection setting signals between the subscriber terminal A1 and the ATM access system 1 and between the ATM access system 1 and the ATM exchange 6 are received by the ATM exchange 6 from the maintenance person or the subscriber terminal A1 (step 110), the subscriber terminals A1 and A
In order to establish a connection between the ATM access system 1 and the ATM access system 1 and the ATM exchange 6, a signal procedure between the ATM exchange 6 and the ATM access system 1 is used to set up a connection from the ATM exchange 6. The connection data is transmitted to the ATM access system 1 (step 120).

The ATM access system 1 which has received the connection data sets the connection data in the subscriber line corresponding unit 8 and the subscriber line connecting unit 11 (step S1).
130) After the connection setting is completed, a connection setting completion signal is transmitted to the ATM exchange 6 (step 140). Upon receiving the connection setting completion signal from the ATM access system 1, the ATM exchange 6 transmits the connection data transmitted to the ATM access system 1 in step 120 to the secondary storage medium 12 provided in the ATM exchange 6. The data is stored as connection data 13 of the ATM access system 1 (step 150), and the connection setting process is terminated (step 160).

When the ATM access system 1 encounters a failure and is initialized and all communication paths are disconnected (step 210), the ATM access system 1 completes the initialization after completing the initialization.
An initialization notification signal is transmitted to the ATM switch 6 (step 220). The ATM exchange 6 that has received the initial setting notification signal of the ATM access system device 1 uses the ATM access system device translation table 13a to convert the ATM access system device 1 from the connection data 13 stored in the secondary storage medium 12.
The subscriber line corresponding section translation table 13b and the subscriber line connecting section translation table 13c are selected.

Next, based on the subscriber line corresponding unit identification ID and the subscriber line collecting unit identification ID, the cell header pre-conversion data (VPI value,
VCI value) and data after cell header conversion (VPI value, V
CI value) 13d and data (VPI value, VCI value) before cell header conversion for each subscriber to be set in the subscriber line connection unit 11.
Value) and cell header converted data (VPI value, VCI
Value) 13e, and in the same manner as in the connection setting process of step 120, the ATM exchange 6 sends the ATM
The connection data 13 is transmitted to the access system 1 (step 230).

The ATM access system 1 which has received the connection data 13 sets the connection data 13 in the corresponding subscriber line corresponding unit 8 and subscriber line connecting line corresponding unit 11 by using the connection setting process of step 130 (step 130).
240) When the connection setting is completed, a connection setting completion signal is transmitted to the upper ATM switch 6 (step 250). ATM that has received the connection setting completion signal
The exchange 6 confirms that all the connections accommodated in the ATM access system 1 have been restored (step 260).

If there is an unrecovered connection, the connection data 13 of the unrecovered connection is selected in the same manner as in step 230, and the connection data 13 is sent to the ATM access system 1 in the same manner as the connection setting process in step 120. Transmits connection data 13 (step 270).
, 280). On the other hand, if all the connections have been recovered, the connection recovery processing is completed (steps 270 and 290).

[0024]

As described in detail above, according to the present invention, an end-to-end connection is established.
The exchange stores the connection data transmitted to the access device on its own secondary storage medium, initializes the access device when it encounters a failure, and disconnects all communication paths through the access device. When the switching is performed, the exchange transmits the connection data of the access device stored in the secondary storage medium to the access device in the same manner as the connection setting process, so that the access device has a connection restoration processing program. Even if it is not provided, connection data can be restored if only the connection setting processing program is provided. That is, there is an excellent effect that the program of the access system can be simplified and the amount of memory can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a form of an ATM network when an ATM access system device is introduced.

FIG. 2 is a functional block diagram of an ATM access system device.

FIG. 3 is a block diagram showing a detailed configuration of a subscriber line corresponding unit and a subscriber line connecting unit;

FIG. 4 is a diagram showing a detailed configuration of connection data stored in a secondary storage medium of the exchange.

FIG. 5 is a flowchart illustrating a process according to the embodiment;

FIG. 6 is a flowchart showing another process of the embodiment.

[Explanation of symbols]

1, 2, 3, 4, 5 ATM access devices 6, 7, ATM switch A1, A2, B1, B2, C1, C2, D1, D2, E
Subscriber Terminal 8, 9 Subscriber Line Correspondence Inside ATM Access System 10 Switch Inside ATM Access System 11 Subscriber Concentrator Line Correspondence Inside ATM Access System 12 Secondary Storage Medium Inside ATM Switch 13 Connection Recovery Data 8a, 11a Cell header conversion unit 13a ATM access system device translation table 13b Subscriber line corresponding unit translation table 13c Subscriber line connection line corresponding unit translation table 13d, 13e Cell header pre-converted data (VPI value,
VCI value) and data after cell header conversion (VPI value, V
CI value)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Shiraishi 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] A plurality of subscriber terminals are connected via one or more access devices, and when an end-to-end connection between subscriber terminals is set or released, a signal between an exchange and an access device is provided. A function of transmitting connection data from an exchange to an access system according to a procedure, and the access system setting or releasing a connection for conducting or releasing a communication path from a subscriber terminal to the exchange based on the connection data. In a connection network having an access network, a method for restoring a connection in an access system when the access system encounters a failure, the exchange stores connection data on a secondary storage medium of the exchange itself, and the access system fails. When an initial setting is made and all communication paths are disconnected, the access equipment Sends a setting notification signal,
When the exchange receives the initial setting notification signal, the exchange transmits the connection data stored on the secondary storage medium to the access device again by a signal procedure. A connection restoration method in an access system, wherein a communication path from a plurality of subscriber terminals to an exchange is restored to a state before a failure by setting a connection set in the access system.