JPS62147852A - Forced release system for digital subscriber - Google Patents

Abstract

PURPOSE:To attain instantaneous calling by sending a cut-off signal and a resource release signal continuously from a call processing processor when a fault takes place at a part of a network so as to release a release standby state even when cut-off signals collide with each other. CONSTITUTION:If the fault takes place at a part of network, the call processing processor 10 detects it and sends a cut-off signal 1 and a resource release signal 2 continuously to a line concentration stage processor 20. When no cut-off signal is generated from a digital subscriber terminal equipment 30 in this case, the cut-off signal is used for a conventional release processing after the line concentration and succeeding stage and a resource release signal 2 is treated as an invalid signal by a line concentration stage processor LPR. When a cut-off signal is generated from the digital subscriber terminal equipment 30 conversely, the cut-off signal sent from the call processing processor 20 is treated as an invalid signal by the line concentration stage processor 20 and the resource release signal makes the conventional processing of the line concentrating and succeeding stages effective. Thus, the release standby state of the line concentration stage processor is released as fast as possible.

Description

[Detailed description of the invention] [) Already required] When an abnormality occurs in a part of the network of a digital switching center, the network control device (call processing processor) detects this and continuously sends a disconnection signal and a resource release signal. The disconnection signal is released by releasing the call control data in the memory of the call processing processor that controls the network that has become abnormal after sending the resource release signal. to avoid collisions and make immediate calls possible.

[Industrial application field]

The present invention relates to a forced release system for digital subscribers, and more specifically, the present invention relates to a system for forced release of digital subscribers, and more specifically, a digital subscriber system that can successfully transition the exchange connection function of an exchange system to a good state when an abnormality occurs in a part of the network of a digital exchange center. Regarding the forced release method.

In a digital switching center, it is important for communication to occur normally that the network formed by the exchange is formed without any failures.

However, if an abnormality occurs in the network where switching is controlled due to various failure factors, the switching function for subscribers will be lost.

Therefore, countermeasures must be taken in order to provide maximum serviceability to subscribers.

[Conventional technology]

In a conventional digital exchange, as shown in FIG.
The analog line concentration stage (LPR) 20'
C) 201, the network control device (CPRi
, CPRj) 10', and is connected to its own station or to another station via its switching function. In this exchange, it is sufficient to have the exchange status information in the network control device 10'.

However, when digital subscriber terminals are digitized, network termination equipment (NTE) 301 of a plurality of digital subscriber terminals (telephone/data terminals TCE) 30'
and the digital concentrator stage (DLC) 40 of the digital switching center.
1 (see Fig. 4), it is not enough to have the network controller 10' have the exchange status information of that exchange, but the digital concentrator controller 40' In other words, it is necessary to provide a state memory (B) 402 as shown in FIG. This is to control multiple communications between the digital subscriber terminal and the digital concentrator.

The release sequence from the TCE side in such a configuration is as follows (see FIG. 5). That is, when the telephone/data terminal TCE ends a call, it transmits a disconnection signal to the concentrator controller LPH and enters a release waiting state. phone/
The disconnection signal from the data terminal TCE is sent to the concentrator stage controller LP.
At the same time that the disconnection signal is received at R and sent from the concentrator controller LPR to the network controller CPR, the concentrator controller LPR itself enters a release waiting state. The network control device CPR that has received the disconnection signal sends a disconnection signal to another network control device CPR, and at the same time enters a release waiting state. When a resource release signal is received from another network controller CPR, the resource is released, that is, the call control data corresponding to the call in the state memory A is erased (released), and the resource release signal is sent to the concentrator controller L.
Send to PH. When the concentrator controller LPR receives the resource release signal, it sends the resource release signal to the telephone/data terminal TCE.

Telephone/data terminal TCE that received the resource release signal
releases the resource and transmits a resource release notification signal to the concentrator controller LPR, causing the resource to be released, that is, the call control data corresponding to the call in the state memory B to be erased (released).

Thus, the communication path that was established for that call is released.

Further, the release sequence when an abnormality occurs in a part of the network during a call is as follows (see FIG. 6).

When an abnormality occurs in a part of the network, such as a power cut, the network control device 10' detects this, sends a disconnection signal to the concentrator control device LPR, and puts itself in a state of waiting for release. Upon receiving the disconnection signal, the concentrator controller LPR transmits the disconnection signal to the telephone/data terminal TCE and puts itself into a release waiting state. In response to receiving the disconnection signal, the telephone/data terminal TCE indicates the cause of the disconnection, releases it, and sends a resource release signal to the concentrator controller LPR. Upon receiving the resource release signal, the concentrator controller LPR releases its resources, that is, releases the status memory B, and also releases the resource release signal from the network controller CPR.
Sends a resource release signal to. The network controller CPR responsive to the resource release signal releases its resources, ie releases the state memory A.

[Problem that the invention seeks to solve]

Although both of the release sequences described above were for the case where the disconnection signals did not originate from the telephone/data terminal TCE or the network controller CPR at the same time, under the above-mentioned disconnection scheme, both the telephone/data terminal TCE side and the network If a disconnection signal is generated from the control device CPR side at the same time, there is no way for the concentrator control device LPR to come out of the release waiting state, that is, to release resources, and the communication path can be released immediately. You will be unable to make calls.

The present invention was created in view of the above problem, and even if a disconnection signal is generated simultaneously from a telephone/data terminal and a network control device, the concentrator stage control device is released from the release waiting state as soon as possible. The purpose of this invention is to provide a forced release system for digital subscribers that can make immediate calls.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In FIG. 1, 10 and 20 are respectively a network control device and a concentrator control device (hereinafter referred to as
They are called call processing processors and concentrator processors. ). 30 is a digital subscriber terminal device. 1,2
are a disconnection signal and a resource release signal, respectively, which are continuously transmitted from the call processing processor. 3.4 are a disconnect signal and a resource release signal respectively transmitted from the concentrator processor 20 to the digital subscriber terminal 30.

5.6.7 are disconnection signals transmitted from the digital subscriber terminal device 30 to the concentrator processor 20, respectively.

These are a resource release signal and a resource release notification signal.

8.9 from the concentrator stage processor 20 to the call processing processor 1
The disconnect signal and resource release signal sent to 0.

[Effect]

When an abnormality occurs in a part of the network, the call processing processor 10 detects this and successively transmits a disconnection signal 1 and a resource release signal 2 to the concentrator processor 20. At that time, if a disconnection signal is not generated from the Digimol subscriber terminal f30, the disconnection signal is used to effectively cause normal release processing after the concentrator stage, and the resource release signal 2 is sent to the concentrator stage processor LPR. Treated as an invalid signal.

Conversely, if a disconnection signal is generated from the digital subscriber terminal device 30, the disconnection signal sent from the call processing processor 2° is treated as an invalid signal by the concentrator processor 2°, and the resource release signal is sent to the concentrator stage. Used to effectively trigger subsequent normal release processing.

In this way, the release waiting state of the concentrator processor can be released as soon as possible, allowing immediate call origination.

〔Example〕

The hardware configuration of the embodiment of the present invention is the same as that shown in FIG. 4, and when the call processing processor 1o detects an abnormality in a part of the network, it continuously transmits a disconnection signal and a resource release signal to the concentrator side. The release of the resource (release of state memory A) causes the concentrator processor 20 to respond to the disconnection signal from the call processing processor 10 and the resource release signal according to whether or not a disconnection signal is generated from the telephone/data terminal 30. A characteristic part of the present invention lies in the fact that this occurs.

That is, as shown in FIG. 2, when the call processing processor CPR is busy, an abnormality occurs and the call processing processor CPR successively sends a disconnection signal and a resource release signal to the concentrator processor LPR. When you do,
If the telephone/data terminal TCE has not sent a disconnect signal to the concentrator processor LPH, the disconnect signal transferred from the call processing processor CPR to the concentrator processor LPR is not accepted by the concentrator processor LPR. However, the resource release signal is treated as an invalid signal by the concentrator processor LPR and does not cause any processing.

In addition to this, the call processing processor CPR causes its own resource release.

When the disconnection signal is received by the line concentrator processors L and PR, it is transmitted from the line concentrator processor LPR to the telephone/data terminal T.
A disconnection signal is sent to the CE and the CE itself enters a release waiting state.

When the telephone/data terminal TCE receives the disconnection signal, it indicates the cause of the disconnection and sends a resource release signal from the telephone/data terminal TCE to the concentrator processor LPR.

When the resource release signal is received by the concentrator processor LPR, it causes the resource release, that is, the erasure of the call control data corresponding to the call in the state memory B (release of the state memory B), and the resource release signal is sent to the call processing processor CP.
The signal is sent to the call processing processor CPR.
is treated as an invalid signal.

Further, as shown in FIG. 3, when the call processing processor CPR is in the middle of a call, an abnormality occurs in a part of the network, and the call processing processor CPR detects this and sends a disconnection signal and resource to the concentrator processor LPR. While continuously transmitting the release signal, the call processing processor CPR causes the release of its resources, ie the erasure of the call control data corresponding to the call in the state memory A (release of the state memory A). At that time, if a disconnection signal is being sent from the telephone/data terminal TCE to the concentrator processor LPR, that is, if a collision of disconnection signals has occurred, the call processing processor CPR is Upon sending the disconnection signal, the concentrator processor LPR enters a release wait state.

The call processing processor CPR handles the transmitted disconnection signal as an invalid signal.

Since the concentrator stage processor LPR is put into a release waiting state by the disconnection signal from the telephone/data terminal TCE, the disconnection signal from the call processing processor CPR is treated as an invalid signal, and the resource release signal from the call processor CPR is used as the concentrator. The acceptance is accepted by the stage processor LPR;
and from the concentrator stage processor LPR to the telephone/data terminal T.
A resource release signal is transmitted to the CE, and upon release, a resource release notification signal is transmitted to the concentrator processor LPR.

When the concentrator stage processor LPR receives the resource release notification signal, it releases the resource, that is, releases the status memory IJB (deletes the call control data corresponding to the call in the status memory B).
give rise to

〔Effect of the invention〕

As explained above, according to the present invention, when an abnormality occurs in a part of the network, the call processing processor successively sends out a disconnection signal and a resource release signal. Since the waiting state can be successfully released, it is possible to make an immediate call.

[Brief explanation of drawings]

Figure 1 is a block diagram of the principle of the present invention. Figure 2 is a release sequence diagram when there is no collision in the disconnection signal when an abnormality occurs in the network. Figure 3 is a diagram of the release sequence when there is a collision in the disconnection signal when an abnormality occurs in the network. Figure 4 is a system configuration diagram of the switching system. Figure 5 is a release sequence diagram when the call is terminated at the telephone/data terminal TCE. Figure 6 is the generation of a disconnection signal from the telephone/data terminal TCE. FIG. 3 is a release sequence diagram when an abnormality occurs in the network in a state where there is no network. 1 and 4, 1.3.5.8 is a disconnection signal, 2.4 and 6.9 are resource release signals, 7 is a resource release notification signal, 10 (CPR) is a call processing processor, and 20 ( LPR) is a concentrator stage processor, 30 (TCE)
is a telephone/data terminal, 101 (NW) is a network, 401 (DLC) is a digital concentrator stage, 301 (NW) is a network
TE) is a network terminal equipment, and 102 (A) and 402 (B) are state memories.

Claims (1)

[Scope of Claims] A digital switching center that is connected to a digital subscriber terminal and has a concentrator controller, a network that is connected to the digital concentrator, and a network controller that controls the network, When an abnormality occurs in a part of the network, the network control device detects this and continuously transmits a disconnection signal (1) and a resource release signal (2), and a disconnection signal is generated from the digital subscriber terminal device. If not, make the disconnection signal (1) valid for normal release processing after the digital concentrator stage and disable the resource release signal,
A digital subscriber characterized in that when a disconnection signal is generated from the digital subscriber terminal device, the disconnection signal (1) is disabled and the resource release signal is enabled for normal release processing after the digital concentrator stage. forced release method.