KR0174402B1 - Connection Control Method in Digital Switching System - Google Patents

Abstract

The present invention relates to a connection control method in a digital switching system, and to provide a connection control method implemented in a digital switching system for evolving a digital switching system into a service switch for an advanced intelligent network. Clustering a view; A second step of constructing an internal communication path by occupying resources internally with respect to the view resulting from the clustering; And a third step of removing the view from the cluster after performing the first step and the second step until the final view, and constructing a real internal call path, and flexibly implementing a connection control function for an advanced intelligent network. There is.

Description

Connection Control Method in Digital Switching System

1 is a structural diagram of a general advanced intelligent network.

2 is a schematic structural diagram of a digital exchange system to which the present invention is applied.

3 is a detailed configuration example of a call / service processing unit to which the present invention is applied.

4 is a flowchart illustrating an embodiment of a connection control method according to the present invention.

* Explanation of symbols for main parts of the drawings

10: service control system 11: common line signal network

12: digital exchange system 20: call / service processing unit

21: switch control unit 22: digital subscriber matching unit

23: digital relay line matching unit 24: switch

25: conference call device 26: voice guidance device

30: service control unit 31: connection control unit

32: service exchange function unit 33: call control function unit

The present invention relates to a connection control method in a digital switching system, and more particularly, to a connection control method implemented in a digital switching system for evolving a digital switching system into a service switch for an advanced intelligent network.

In the highly intelligent network, the service exchanger is a key element of the highly intelligent network which plays the following roles.

-Establish / test / disconnect connections between subscribers or large powers;

-Establish / manipulate / disable the channel in the system

Recognize the occurrence of intelligent network services

Report the status of the call / connection to the service control system of the advanced intelligent network.

-Change the call / connection state according to the command of the service control system of the advanced intelligent network.

Service exchangers that play these roles are generally implemented by improving the exchange system. That is, two software modules, a call control function module and a service exchange function module, are loaded in the exchange system. The last of the above functions is the network capability newly introduced in the highly intelligent network. The International Telegraph and Telephone Advisory Committee (CCITT) standardization body, which has standardized the capabilities of highly intelligent networks, has developed a call / connection model to flexibly introduce these capabilities into the network. The feature of this model is the use of a connection view abstracted into the object-oriented concept as a report on the current connection state resulting from the interaction between the service exchange function module and the service control system and the transition to the next connection state. This processing model allows for the flexibility to introduce the necessary interactions into the network.

However, there is a difficulty in controlling the connection through the reference of the connection view, which the service exchange which has to perform the connection control function has the following difficulty.

The view of the connection provided by the service control system abstractly shows the information flow state from the exchange external point of view, not from the internal call point of view.

The view of the connection provided by the service control system is not particularly limited and can provide a very complex view.

Continue to provide new views as intelligent network service processing progresses.

A view is a relationship expressed according to the concept of incoming / outgoing call separation, which provides only a view of the connections associated with your service.

Since this view exists for each intelligent network service, if one leg (Leg) represents an object-oriented concept of a subscriber or trunk line matching device), two or more intelligent network services operate on the same leg. Exist at the same time.

When configured as an internal call in a typical digital switching system, the entire path from the originator to the destination is found at once. In addition, in hardware, it is often impossible to configure only the currency corresponding to half of the entire channel. It is impossible to flexibly introduce the connection control function required for the above highly intelligent network to the switching system having such a connection configuration method and a switch structure.

It is therefore an object of the present invention to provide a connection control method which is loaded on the service exchange function of the digital exchange system in order to flexibly evolve the digital exchange system to the service exchange.

In order to achieve the above object, the present invention provides a connection control method applied to a digital switching system for use as a service switch for an advanced intelligent network, comprising: a first step of clustering a received view when a view is received from a service control unit; ; A second step of constructing an internal communication path by occupying resources internally with respect to the view resulting from the clustering; And a third step of removing the view from the cluster after performing the first step and the second step until the final view and configuring the actual internal currency path.

The present invention comprehensively provides the following capabilities to the service switching function and the call control function.

-Have the ability to translate abstract representations of the information flow state into representations in the internal currency.

Has the ability to generate representations in the correct internal currency even for any complex view.

As new views are provided, they have the ability to flexibly control the call. In this process, avoid disconnecting existing connections and establishing new ones as much as possible.

-The exchange software has the ability to separate incoming and outgoing calls independently, with only half the currency represented in the internal currency. This eliminates the need to reflect the view of another leg.

If more than one view is provided for a leg, it has the ability to verify that there are conflicting representations between each other and to convert them into representations in a comprehensive internal currency that encompasses all of them. Each instance present in the service switching function has an ability to provide its own external view.

In order to achieve the above object, the present invention provides a method for controlling connection using a subscriber switching device, a digital trunk line matching device, a switch device, and a digital switching system including a call / service processing unit and a switch control unit for controlling the devices. Clustering the view as soon as it arrives from the service control system, obtaining an internal channel covering all the views shown in the cluster found in the process, constructing the channel in software, and substantially (hardwarely) ) It consists of the process of constructing the internal channel and removing the view from the cluster. In this case, the final process is performed only when the provided view is the last view delivered by the service control system.

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

1 is a structural diagram of a general advanced intelligent network.

Integrated Services Digital Networks (ISDN) provide end-to-end connectivity between all kinds of narrowband terminals, including Integrated Services Digital Network (ISDN) telephones, Zippo (G4) faxes, and Videotexes, using digital transmission and digital exchange technologies and digital signaling techniques. It is a network.

Digital switching system 12 provides a connection between adjacent nodes present in the end-to-end connection. In addition, when the user requests the intelligent network service, an abstract view of the current call / connection is configured and delivered to the service control system 10, and after the service control system 10 provides a command, this is performed.

When the service control system 10 is informed from the digital switching system 12 that an intelligent network service request has occurred or has performed a command provided, the service control system 10 immediately checks the current state by referring to the service processing model, and then checks the next call / connection state. Proceed with the service by providing a view.

The common line signal network 11 is a high speed packet communication network that conveys a view between the digital switching system 12 and the service control system 10.

2 is a schematic structural diagram of a digital exchange system to which the present invention is applied.

The call / service processing unit 20 interacts with the digital subscriber matching unit 22 and the digital relay line matching unit 23 to control the connection (i.e., internal call path) from the originating digital subscriber or relay line to the incoming digital subscriber or relay line. do.

The switch control unit 21 interacts with the call / service processing unit 20 to control the establishment / cutting / testing of the call path.

Under the control of the call / service processing unit 20, the digital subscribing unit 22 separates the B-channel and the D-channel, allocates / receives the B-channel, and performs the layer 2 protocol of digital subscriber signaling. To do it.

The digital relay line matching unit 23 substantially controls the establishment / test / release of the line under the control of the call / service processing unit 20.

The switch 24 is controlled by the switch controller 21 to provide a physical internal communication path within the switch.

The conference call device 25 is a special resource existing in the system and is a device that N-1 mixes information between associated legs. Where N is a natural number.

In addition, the voice guidance device 26 is a special resource for providing fixed voice guidance to the legs.

3 is an exemplary configuration of a call / service processing unit to which the present invention is applied.

The call control function unit 33 performs general call processing when a call is requested from the digital subscriber matching unit 22 or the digital relay line matching unit 23. If it is recognized that the intelligent network service is requested during execution, it notifies the service controller 30.

When the service control unit 30 receives the request for the intelligent network service, the service control unit 30 configures a view of the current call / connection state and notifies the service control system 10. When the view is received as a command, the view is transmitted to the connection controller 31.

The connection control unit 31 plays the most important role for the digital exchange system to evolve into a service switch for the highly intelligent network. This block is responsible for substantially executing the commands provided by the service control system 10.

4 is an overall flowchart of a connection control method according to the present invention.

In the standby state, when the connection control unit 31 receives a view from the service control unit 30 (41), it immediately clusters the related views (41).

The clustering method depends on what view the service control unit 30 provided. If the service control unit 30 newly provides a view, it checks whether or not a cluster referring to the leg exists for all legs, and if there is, adds the view to the cluster, otherwise creates a new cluster. If you provided a modified view for the previously provided view, it checks whether there is a new leg, and if there is a new leg, checks whether there is a cluster referencing this leg for the new leg. Join clusters if they exist.

After the cluster formation process, the connection control unit 31 configures the view as the only internal call. That is, draw a picture in which all the information flow representations of the views shown in the cluster are converted to representations in currency (42). In this process, the information flow state shown in the external view is for any internal call path that appears as a subscriber / relay device, a switch device, and, if necessary, an information processing device (e.g., conference call device, voice guidance device) of a digital switching system. Is converted to a picture. The system then immediately accesses the database of the system and seizes the available resources for the switches and channels shown in the figure (43). In this way, the channel is configured in software by occupying only the resources internally without the actual path.

Then, it checks whether all required resources are occupied (44), and if all are occupied, a success result (46) and a failure result (45) to the service controller 30.

After the reporting process is completed, the connection control unit 31 should check whether the provided view is the last view provided by the service control system 10 (47). In the case of the finally provided view, the view is removed from the cluster, and the switch control unit 21 is controlled to configure the actual call path in hardware (48). If it is not the last view provided, it transitions to the wait state.

The present invention configured and operated as described above is impossible to configure in half of all the call paths, and it is possible to flexibly implement a connection control function for an advanced intelligent network even in an exchange where all the call paths are found at once. .

Claims (4)

A connection control method applied to a digital switching system for use as a service switch for an advanced intelligent network, comprising: a first step of clustering a received view when receiving a view from a service control unit; A second step of constructing an internal communication path by occupying resources internally with respect to the view resulting from the clustering; And a third step of removing the view from the cluster after performing the first step and the second step until the final view, and constructing an actual internal currency path. The method of claim 1, wherein the clustering of the first step checks whether or not a cluster that refers to the leg exists for all legs if it is a new view, adds the view to the cluster if it exists, and creates a new cluster if not. And if the view is changed, examine whether there is a new leg, and if there is a new leg, examine whether there is a cluster referencing the new leg, and merge the cluster if there is one. 3. The method of claim 1 or 2, wherein the second step comprises: a fourth step of drawing a picture in which all information flow representations of the views presented in the cluster have been converted to representations in currency; A fifth step of accessing a database to occupy available resources for the switches and channels shown in the figure; And a sixth step of checking whether all required resources are occupied and reporting the occupancy result to the service control unit. 4. The method of claim 3, wherein the third step comprises: a seventh step of checking whether the received view is a view finally provided by the service control system; An eighth step of removing the corresponding view from the cluster in the case of the finally provided view and transitioning to the first standby state after configuring the actual internal call path in hardware; And a ninth step of immediately transitioning to the first standby state if the view is not finally provided as a result of the checking of the seventh step.