KR950005988B1 - Path control method in electronic switching systems - Google Patents

Abstract

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Description

How to control the currency of the electronic exchange

1 is a structural diagram of hardware to which the present invention is applied.

2 is a flow chart showing the overall performance of the present invention.

3 is a flowchart showing a process of assigning currency.

4 is a flowchart illustrating a process of connecting a call.

5 is a flowchart showing a cutting process of a call.

6 is a flowchart illustrating a call release process.

* Explanation of symbols for main parts of the drawings

10: 1st and 3rd subscriber exchange subsystem (ASS-1)

20: 2nd subscriber exchange subsystem (ASS-2)

30: nth subscriber exchange subsystem (ASS-n)

40: network subsystem (INS)

The present invention relates to a channel control method capable of minimizing a shortage of a telephone and a truncation during a telephone call of an electronic exchange.

Electronic exchanges are creating devices with less currency than acceptable subscriber capacity, taking into account economics and processing capacity. The electronic switch having this structure requires a tangential function in addition to the exchange function, so that the channel is classified and managed as a common resource. However, the electronic switch has computer-scaled programmatic control, so that data loss, program error and Because the processing sequence mismatch can not be completely prevented, shortage of currency and cutting may occur during a call. In other words, the phenomenon that the channel is not recovered due to a limited currency continues to accumulate over a long period of time, causing a channel shortage in the call, and further weakening the exchange. In addition, if a channel is assigned to a call and is in a call, and for some reason, the channel is repeatedly assigned to another call, the call may be disconnected from the call.

Conventional small and medium-sized electronic exchanger is less likely to occur the above phenomenon, but large electronic exchanger is likely to occur structurally, resulting in a decrease in reliability. The reason for this is that large electronic exchangers have a large number of sub-systems that can accommodate subscribers in a unit of scale as the capacity becomes larger. This is because it has a dualized structure that is independently controlled by.

Accordingly, an object of the present invention is to solve the problems of the prior art, and in order to increase the call service reliability of the exchange, a call path due to data corruption, program error, and processing sequence mismatch according to the load level is applied to a large scale electronic switch. The present invention provides a method for controlling a channel to minimize shortage and cutting during a call.

In order to achieve the above object, the present invention, the network network subsystem (INS) to perform a call processing function by embedding a space switch (SSW); And a plurality of exchange subsystems (ASS) connected to the network system and having a built-in time switch (TSW) for performing centralized management of calls. A first step of allocating a channel to a calling party and a called party by a call; A second step of connecting a call path by connecting a time switch of a calling subscriber and a time switch of a called subscriber after performing the first step; A third step of cutting the call switch by cutting the time switch of the calling subscriber and cutting the time switch of the called subscriber after performing the second step; And after performing the third step, characterized in that it comprises a fourth step of releasing the channel by the call of the calling party and the called party.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

FIG. 1 is a schematic diagram showing the overall structure of a call system of an electronic switching system, which is hardware to which the present invention is applied. In FIG. 10, first and third subscriber exchange subsystems (ASS-1) and 20 are second subscriber exchanges. A subsystem (ASS-2), 30 represents an nth subscriber exchange subsystem (ASS-n), and 40 represents a connection network subsystem (INS).

As shown in the figure, the electronic switching system to which the present invention is applied is composed of two kinds of subsystems, a network subsystem 40 and a plurality of subscriber switching subsystems 10 to 30, and T (time switch) -S. (Space switch) -T (Time switch) structure. The subscriber switching subsystems 10 to 30 perform the call processing function of the distributed accommodation subscriber or the relay line, and may increase the number according to the subscriber accommodation plan. The network subsystem 40 performs the centralized management function by distributed call of subscribers, the subscriber switching system 10 to 30 controls the time switch (TSW) and the network subsystem 40 is a space switch (SSW) To control.

The overall operation of the present invention configures a call path by dividing a call between the same subsystem and a call between different subsystems when constructing a call path to two subscribers. Call channel control analyzes the information of two subscribers' calls before assigning channels to the call so that there is no channel in the unrecovered call and prevents channel shortages. Investigate if it has already been reassigned to prevent truncation during the call. In addition, when the call is released, the information of two subscribers can be changed at the same time so as not to be affected by the mismatch of the processing order.

2 is an overall flowchart of the present invention.

Looking at the overall process, after assigning channels to two calling and receiving parties (21), the time switch of the calling party is connected, the time switch of the called party is connected, and the call path is connected (22). After the time switch is cut and the time switch of the called party is cut to cut the call path (23), the channel of the calling party and the called party is released (24).

Hereinafter, with reference to FIGS. 3 to 6 will be described in detail the processing step by step.

3 is a detailed flowchart of a process 21 of allocating a channel by a call to two subscribers.

Incoming and outgoing two subscribers (calling subscriber: subscriber 1, called subscriber: subscriber 2 or subscriber 3) receive the configuration request and analyze the information on the calls of the two subscribers before assigning the channel to the call. First, the call channel information of the calling subscriber is used to examine whether the channel is released by the call configured in the last call of the subscriber. The called party also checks whether the channel is released by the call configured in the last call, like the calling party. As a result, when the information of the two subscribers is confirmed to be normal, the channel assignment to the two subscribers is possible (31). However, if it is not released, it is determined that an error has occurred, and after releasing the channel with the call of the subscriber associated with the channel, the called party can go through the same process as the calling party and then assign the channel to the two subscribers. (32). In this way, when the two subscribers can be assigned to the call, the channel is determined by determining the type of the call.

The call path type is divided into TT (Time Switch-Time Switch) and TST (Time Switch-Space Switch-Time Switch). (33) Two subscribers are accommodated in the same subsystem. If so, the channel is assigned to the TT call managed by this subsystem (35, 36). At this time, if there is no channel as an available T-T call, T-S-T channel is allocated (34). If the two subscribers are accommodated in different subsystems, the channel is allocated to a T-S-T call using a spatial switch managed by the network subsystem (INS) (37, 38, 39, 39-1). If there is no channel with an available T-S-T call, it announces that the call cannot be allocated and stops the call service (39-2). In this way, when the completion of the call assignment to the two subscribers, the call state of the two subscribers is assigned to the call.

4 is a detailed flowchart of a process 22 of connecting a call path to two subscribers.

The call connection processing is performed independently of each other in the order of call progression without simultaneously calling party and called party. First, it receives the call request of the calling subscriber and uses the call information to check whether the call channel is assigned (41). If assigned, the time switch is connected and the call information is connected to the call (42). Otherwise, it determines that an error has occurred and informs the calling party that the call service is impossible and stops the call service (43).

Next, upon receiving the call request of the called party, it is checked whether the channel is assigned to the call using the call information as in the calling party process (44). If assigned, the time switch is connected and the call information is connected to the call. It is set as a state (45). If not, it determines that an error has occurred, notifies the calling party and the called party that the call service is impossible, and stops the call service (46). This process can prevent the disconnection or misconnection during the call of another call.

5 is a detailed flowchart of a process 23 for cutting a call path connected to two subscribers.

The call disconnection processing is performed independently of each other according to the call progress sequence without simultaneously performing the calling party and the called party. First, the call request is received by the calling subscriber, and the call path information is checked using the call path information (51). If connected, the time switch is cut and the call path information is allocated to the call state (52). Otherwise, it is determined that an error has occurred and no cutting process is performed. Next, upon receiving the call request from the called party, it is checked whether the call path is connected using the call path information in the same manner as the calling party process (53). If connected, the time switch is cut and the call path information is assigned to the call. (54). Otherwise, it is determined that an error has occurred and no cutting process is performed. Afterwards, the subscriber can reconnect to the channel at the request of the subscriber, and this process can prevent in-call truncation of other calls.

6 is a detailed flowchart of a process 24 of releasing a channel in a call assigned or connected to two originating and receiving subscribers.

The release process requires a request from both the calling party and the called party to release the channel using the actual call. In response to the call release request of the calling subscriber, the call information is analyzed (61). If the call path is connected, the call path is disconnected and the call is released to the call release processing. If it is already released, no processing is performed, and if the channel is allocated to the call, the processing is passed to the release processing (63). If the call is received by the called party, the caller goes through the same process. This releases channel resources from both subscribers after the call is requested from both sides. The channel release is performed as follows according to the channel type (63). If the call path type is T-T, the channel in the subsystem assigned to the two subscribers is switched to the available state and the information is released to the call of the two subscribers (64, 66, 67). In the case of T-S-T, the channel is switched to the available state of the call of the network subsystem (INS) and the information of the call is released to the call (65, 66, 67). This process can prevent errors caused by mismatches in the processing order and prevent the channel from being restored.

The present invention, which operates by the above-described processing procedure, preempts data corruption, program error, and processing sequence mismatch according to the load level when the exchange system controls the call channel for the call service using the channel channel, which is a common resource. By recognizing and correctly using the common resources of the exchange system, there is an application effect that can prevent or minimize the shortage of the currency and cutting during the call to ensure high reliability of the exchange system.

Claims (5)

A network subsystem (INS) having a built-in space switch (SSW) to perform a call processing function; And a plurality of exchange subsystems (ASS) connected to the network system and having a built-in time switch (TSW) for performing centralized management of calls. A first step (21) of allocating a channel to a calling party and a called party by a call; A second step 22 of connecting a time switch of the calling subscriber and connecting a call path by connecting a time switch of the called subscriber; Cutting the time switch of the calling party and cutting the time switch of the called party to cut the call path; And a fourth step (24) of releasing the channel in the call of the calling party and the called party. The method of claim 1, wherein the first step (21) includes a channel with a recovered channel for investigating whether there is a channel with a recovered channel for a calling party to construct a channel when a channel assignment is requested. A first process (31, 32) of releasing a channel only in a call; A second step (33, 34, 37) of determining the type of the call path and the existence of the call channel after performing the first step (31, 32); A third process (35, 36) of allocating an incoming / outgoing call path by selecting an internal call channel if there is an internal call channel while performing the second process (33, 34, 37); After performing the second process (33, 34, 37), there is a channel in the sub-system, there is no channel in the internal call and there is a channel between the sub-system call and there is a channel between the sub-system call and the inter-system call channel A fourth step (38, 39, 39-1) of allocating an incoming / outgoing call path by selecting a channel between sub-system calls; And a fifth process of notifying that the call cannot be allocated to the call and stopping the call service after performing the second processes 33, 34, and 37, when there is no channel between the sub-systems and the channel between the sub-systems (39-2). Call path control method of an electronic switch, characterized in that it comprises a). 2. The method of claim 1, wherein the second step (22), when requested to connect to the calling party, examines the channel assignment state of the calling subscriber's call, notifies that the call cannot be connected to the call otherwise, and terminates. Connecting the calling channel of the calling subscriber (41 to 43); And when the call is requested to the called party's call, examines the channel assignment state of the called subscriber, notifies that the call cannot be made if the call is not in the assigned state, and terminates. Call path control method of an electronic switch, characterized in that it comprises a. The method of claim 1, wherein the third step (23), when the call to the calling party is called for disconnection, examines the connection state of the calling subscriber's call and terminates if the call is not connected. Later transitioning to the assigned state (51, 52); And if the call is requested to be disconnected from the called party, checking the connection state of the called party's call and ending the connection if not. The currency path control method of the electronic switchboard, characterized in that. The method of claim 1, wherein the fourth step (24), when the channel is requested to release the channel, the call state of the calling party is called and terminated if the channel is released. A first step (61 to 63) of examining the type of the caller of the calling party, the called party when the call is assigned; A second step (64, 66, 67) of releasing a channel from an internal call of a calling party or a called party if the call path is within the subsystem after performing the first steps 61 to 63; And a third process (65 to 67) of releasing a channel to a call between the sub-systems of the originating / receiving subscriber after performing the first processes (61 to 63). How to control the currency of the exchange.