KR100312912B1 - Availability control method by PCM in No.7 common channel signalling - Google Patents

Abstract

The present invention relates to an availability control method for each PCM line in the No.7 common line signaling system that blocks traffic early to prevent unnecessary resource waste when an ISDN user part of an adjacent signaling point is unavailable. By blocking traffic early when the ISDN user part is not available, it eliminates unnecessary message transmission, reduces response waiting time of ISUP relay call, and eliminates unnecessary resource occupancy during response waiting, thereby increasing the completion rate of other ISUP calls.

Description

Availability control method by PCM line in No.7 common line signaling method {Availability control method by PCM in No.7 common channel signaling}

The present invention relates to a PCM line availability control method in the common line signaling method, and more particularly, in the call processing field of the exchange technology, the integrated information communication network (hereinafter referred to as the It refers to a method of processing the availability control of the user part.

In general, the common line signaling method is a signaling method that forms a call line and a dedicated signal transmission line, and controls several call lines using the signal line, and copes with digitalization and comprehensive service by varying the length of signal information. No.7 common line signaling system was developed for this purpose. This No.7 common line signaling system is applied to various services such as telephone service advancement, economicalization and facsimile service.

In the case of a switching system in which a plurality of ISDN user parts exist at one signaling point, it is not possible to determine whether all ISDN user parts are available / disabled with the available / disabled state of one or several ISDN user parts.

As a result, even though the ISDN user part of the power is not available, there is a problem that unnecessary messages and resources are used by initiating traffic.

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and the PCM line is available for each PCM line in the No.7 common line signaling system that blocks traffic early to prevent unnecessary resource waste when the ISDN user part of the adjacent signaling point is unavailable. It is an object to provide a control method.

In order to achieve the above object, the availability control method for each PCM line in the No.7 common line signaling method according to the preferred embodiment of the present invention is a number of No.7 common line signaling method ISDN users for one signal point. In a system where an addition exists,

When the ISDN user part attempts to relay a call, when the station signal point of the message transmitting part is available and no response to the initial address message and no response to the call recovery message, the local ISDN user part does not determine that all ISDN user parts of the country are not available. Notify the network management / overload control unit that only the PCIS line (E1 or T1) containing the Circuit Identificaion Code (CIC) used in the attempt was unavailable, and test the user unit with the ISDN user unit. Transmitting a message and initiating a time check of the timer;

A second step of sending a user part available message to a local ISDN user part through the message transmission part as the large ISDN user part is available by transmission of the user part test message;

And a third step of notifying the network management / overload controller that the large ISDN user part is available and resuming traffic as the local ISDN user part receives the user part available message.

1 is a view for explaining the availability control method for each PCM line in the No.7 common line signaling method according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10: national ISDN user part (ISUP) 20: large country ISUP

30: local message transmission unit (MTP) 40: power station message transmission unit

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

1 is a view for explaining the availability control method for each PCM line in the No.7 common line signaling method according to an embodiment of the present invention.

In the figure, reference numeral 10 denotes a national ISDN user part (ISUP) for performing ISDN call processing of the local station, and 20 denotes a large station installed to face the national ISUP 10 and performing ISDN call processing. In the ISDN user unit, the ISUPs 10 and 20 perform signaling functions necessary for providing circuit switched service and supplementary service for voice and non-voice applications of the ISDN. In particular, the ISUP (10, 20) may output the value (Cause value) representing the release content of the ISDN user part relay call, the cause value of the cause indicator (Cause indicator) parameter included in the release message of the ISDN user In part, the cause values include normal release, incoming call use, and the like.

30 and 40 are message transmitters installed between the local station ISUP 10 and the large station ISUP 20 to transmit and receive a signal message transmitted and received between the local station ISUP 10 and the large station ISUP 20 via a signal network ( MTP; Message Transfer Part).

According to the embodiment of the present invention configured as described above, the PCM line (E1 or T1) including the circuit identification number (CIC) used in the call attempt is used for PCM line availability control in the No. 7 common line signaling inter-station relay call. Blocks relay call traffic only for the ISDN user part of the station, sends a user part test message with a periodically used circuit identification number (CIC), waits to receive the user part available message, and receives the user part available message. If it does, it determines that the power is available and resumes traffic.

That is, the No.7 common line signaling method ISDN user part relay call at the start of the relay call start, the station signal point of the transmission unit 30, 40 is available, no response to the initial address message (IAM) and no response to the call recovery message In this case, only the PCM line (E1 or T1) including the circuit identification number (CIC) used in the call attempt is required to request availability control to the ISDN user.

Accordingly, the local station ISUP 10 notifies the network management / overload control unit (not shown), sends a user part test (UPT) message to the large station ISUP 20, and starts the timer T4. do. Here, the timer T4 is a timer used to start availability control by knowing from the message transmitters 30 and 40 that the state of the power is unavailable.

The user part test message is transmitted to the power station through the message transmitters 30 and 40. When the user part test message is received from the power supply ISUP 20, the power supply ISUP 20 becomes available again. ) Sends a User Part AAvailable (UPA) message to its own station. If the ISUP 20 does not recognize the user part test message, the cause value of the cause indicator of the confusion message (CFN) is transmitted as H'61 (B'110_0001 = D'97). The cause value H'91 is one of the causes related to the protocol error, when a message that cannot be determined by the ISDN user unit 10, 20 comes. If the ISDN user part (10, 20) is the blue version (1998), the user part test (UPT) message which is used only in the white version (1993) cannot be interpreted, so the cause value (H'61) is used. Answer. Although it is not possible to read the User Part Test (UPT) message in the blue version, being able to send a release message makes the ISDN User Part available in the Availability Control as the ISDN User Part can determine that it is available and allows general call processing. .

The user part available (UPA) message and the confusion (CFN) message are again included in the MSU messages of the message transmitters 30 and 40 and transmitted to the local station ISUP 10, and the MSU message is a message indicating the user part available. If the timer T4 is any other message that is stopped, the local ISUP 10 notifies the network management / overload controller that the large ISUP 20 is available and resumes traffic.

If the timer T4 times out, the host ISUP 10 retries from the process of notifying the network management / overload control unit of the availability control procedure request. Calls attempted during availability control are immediately handled by the call failure and reported to the operator for action.

According to the present invention as described above, if the ISDN user part of the adjacent signaling point is unavailable, the traffic is blocked early, eliminating unnecessary message transmission, reducing the response waiting time of the ISUP relay call, and eliminating unnecessary resource occupation during the waiting for the response. This will increase the completion rate of other ISUP calls.

On the other hand, the present invention is not limited only to the above-described embodiments, but may be modified and modified without departing from the scope of the present invention.

Claims (1)

In a system in which multiple No.7 common line signaling ISDN user parts exist for one signaling point, When the ISDN user part relay call attempts, the local station signaling point is available and no response to the initial address message and no response to the call recovery message, the local ISDN user part is connected to the PCM line including the circuit identification number used in the call attempt. A first step of notifying that only the Korean ISDN user unit is unavailable, sending a user unit test message to the international ISDN user unit, and starting a time check of the timer; A second step of sending a user part available message to a local ISDN user part through the message transmission part as the large ISDN user part is available by transmission of the user part test message; And a third step of notifying the network management / overload controller that the large station ISDN user part is available and resuming traffic as the local ISDN user part receives the user part available message. Availability control method per PCM line in signaling method.