KR100604576B1 - Method for providing number portability - Google Patents

Abstract

The present invention relates to a number portability providing method that allows a subscriber to move a carrier freely without changing his or her phone number by using a signaling message and an intelligent network provided by an exchange. The number portability function, which combines the 'Query on Release' method using the method and the intelligent network database, is initially implemented and installed on the network elements required to provide the number portability so that the number portability can be selected by selecting the method within the network. There is an advantage of reducing the additional costs due to the network environment changes and increasing the efficiency of network operation and management.

Description

Method for providing number portability

1 is a block diagram of a communication network according to the present invention.

<Description of Symbols for Major Parts of Drawings>

11: incoming caller who changed the telephone operator 12: existing operator exchange

13: New Business Exchanger 14: Exchange Database

15: relay exchange a 16: intelligent network database

17 relay relay b 18 originating exchange

19: outgoing subscriber

The present invention relates to a method for providing number portability, and more particularly, to a method for allowing a subscriber to move a carrier freely without changing his or her phone number by using a signaling message and an intelligent network.

In general, the technology for providing the carrier number portability of the local telephone number can be largely divided into the technology based on the exchange and the technology based on the intelligent network.

There are two types of switch-based methods: incoming call transmission (hereinafter referred to as Onward Routing) and rerouting (hereinafter referred to as Drop-Back). on Release method) and querying the database for all calls (hereinafter called All Call Query method). In order to provide carrier number portability of local telephone number, number portability function implemented by specific number portability provision method should be installed in required network element.

Since the switch-based method and the intelligent network-based method are implemented separately and installed in the network element, the two methods cannot be installed together and selectively applied in the network element. When the number portability demand is increased or the network capacity is improved and the number portability provision method is to be changed, the additional function is required to implement the related function in a new way and install it on the required network element again. It is difficult to operate and manage the network because the network structure change has a big impact on the network.

In order to solve the above-mentioned problems, the present invention provides a method of managing routing information of a moved number by using an exchange database and a routing of a moved number by using an intelligent network database. The purpose is to provide a number portability providing method that can select information management method in the network.

In order to achieve the above object, in a number portability providing method, when a calling party calls a called party whose number has been moved, the call is input to an exchange to which the called party is subscribed, and the exchange is connected to the called party. A first exchanger of the existing operator who has received the service before moving the service, and when the call is input, determining whether the subscriber is a number ported subscriber;

If the determination result is a number portable subscriber, select the number portability providing method provided by the exchange. If the selected method is a drop-back method, the routing number of the subscriber is detected by searching the database and the selected method is the Query on Release method. A second step of releasing the call by transmitting a release message each generated without collecting a routing number to a previous exchange;

Receiving the release message, if the received message is a release message that provides number portability in a drop-back manner, the call setup message is transmitted to the moved subscriber according to the routing number of the mobile subscriber included in the release message. Connecting the third process with;

Receiving the release message, if the received message is a release message that provides number portability in the Query on Release method, the routing number is retrieved from the database that stores the routing number of the mobile subscriber, according to the routing number And a fourth process of connecting a call by transmitting a call setup message to the moved subscriber.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

To this end, first, the theoretical matters for the present invention will be described.

The intelligent network applied to the present invention follows the 'ITU-T IN CS-1 (Capability Set 1)' standard. The core devices that make up the intelligent network are Service Switching Point (SSP) and Service Control Point (SCP). The service exchanger is located at the originating station, relay station or destination station and is connected to the service control device by a common line signal network.

The exchange database applied to the present invention may be used by connecting to the exchange by using a routing table inside the exchange or by installing a separate database.

In addition, the number portability function applied to the present invention is a combination of the Drop-Back method using the exchange database and the Query on Release method using the intelligent network database, which can be selected and provided in the network. And it is installed in the receiving country.

In addition, the call setup message applied in the present invention, in order to provide number portability as an ISDN signaling message, the call setup (ISUP IAM) message has a parameter indicating the called number, routing number, forward call indicator, number portability capability It is included in the ISDN signaling message, and when the call is released (ISUP REL), the ISDN signaling message includes parameters indicating the cause of the call release, the routing number, and the number portability provision method.

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

1 is a block diagram of a communication network according to the present invention, and includes a subscriber 11 who changes a local telephone company;

An exchange 12 of the existing operator to which the subscriber originally received the service;

A switch 13 of the new operator to which the subscriber has moved and newly subscribed;

An exchange database (14) for managing a routing number of the moved subscriber;

A relay exchanger (15) in charge of relaying with an existing operator exchanger;

An intelligent network database (including SCP) 16 for managing the routing number of the mobile subscriber;

A relay exchange 17 for going to the destination exchange of the change operator;

An originating exchange 18;

A caller 19 of a general telephone user is provided.

When the subscriber 11 in the state as described above in the state of changing the subscription service provider using the existing number as it is described in detail as follows.

The subscriber 11 who wants to receive the number portability stops providing the service from the existing service provider 12 and newly subscribes to the local service to the new service provider 13. At this time, the subscriber 11 maintains its original number as it is. Information about the subscriber's number movement is stored in the exchange database 14 or the database 16 of the intelligent network.

Once the caller 19 dials to call the called party who has moved the number, the call is forwarded to the destination exchange 12 of the existing operator. At this time, the call establishment message (ISUP IAM: ISDN User Part Initial Address Message) transmitted to the destination exchange 12 is a message including the number portability providing capability as described above in the ISDN signaling message.

The destination exchange 12 of the existing operator grasps the fact that the called number is the moved number, and then selects the number portability providing method.

If the selected method is the Drop-Back method, the routing number for the called number is collected using the exchange database 13 or the intelligent network database 16, and then the called number, the call release cause, the routing number, and the number portability method are provided. The release message Dropp including the parameter to be displayed is transmitted to the previous exchange (the relay exchange 15 or the originating exchange 18).

In addition, if the selected method is a Query on Release method, the call is released by sending a release message (Rel) including a parameter indicating a called number, a call release cause, and a number portability providing method to a previous exchange without collecting a routing number. do.

If the previous exchange receiving the release message is the relay exchange a (15), the relay exchange a (15) analyzes the release message and if the drop-back method is supported, the relay exchange b (17) according to the routing number. Or forwards the call to the destination exchange (13) of the change operator. In addition, if the Query on Release method is supported, a query message is sent to the intelligent network database 16, a response message including a routing number is received, and then a call is made to the relay switch b17 or the destination exchange 13 of the change operator according to the routing number. , Or

On the other hand, if the previous exchange receiving the release message is the originating exchange 18, the originating exchange 18 analyzes the release message and if the drop-back method is supported, the relay exchange b 17 or changes according to the routing number. The call is delivered to the destination exchange 13 of the operator. In addition, if the Query on Release method is supported, a query message is sent to the intelligent network database 16, a response message including a routing number is received, and then a call is made to the relay switch b17 or the destination exchange 13 of the change operator according to the routing number. To pass.

In this case, when the release message is transmitted to the originating exchange 18, when the routing number does not need to pass through the relay network a (15), the caller who disconnects the call currently connected to the relay network a (15) and then the called subscriber ( 11) is to prevent unnecessary call connection by allowing direct connection with the call.

Finally, the destination exchange 13 of the change operator connects the call to the subscriber who has moved the number.

As described in detail above, the present invention initially implements and installs a number portability function that combines a drop-back method using an exchange database and a query on release method using an intelligent network database in a network element required to provide number portability. By providing a number portability by selecting a method within, there is an advantage of reducing the additional cost due to the network environment change and increasing the efficiency of network operation and management.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims Should be seen.

Claims (5)

In the method of providing number portability, When the calling subscriber calls the called subscriber who has shifted the number, the call is entered into the exchange to which the called subscriber is subscribed, and the exchange is the called exchange of the existing operator who received the service before the called subscriber moves the number. A first step of determining whether the subscriber is a number portable subscriber when a call is input; If the decision result is a number portable subscriber, select the number portability providing method provided by the exchange. If the selected method is a drop-back method, the routing number of the moved subscriber is detected through a database search. A second step of querying the database only for the transferred call (Query on Release) so as to release the call by transmitting each generated release message to the previous exchange without collecting the routing number; If the received message is received and the received message is a release message providing number portability in a 'drop-back' manner, a call setup message is transmitted to the moved subscriber according to the routing number of the mobile subscriber included in the release message. A third process of connecting calls; Receiving the release message, if the received message is a release message that provides number portability in a 'Query on Release' manner, the routing number is retrieved from the database that stores the routing number of the moved subscriber, the routing number And a fourth process of connecting a call by transmitting a call setup message to the mobile subscriber. The method of claim 1, The information stored in the release message providing number portability in the 'Drop-Back' method in the second process includes a routing number retrieved from the database, a called number, a call release cause, and a parameter indicating a number portability provision method. Number portability providing method characterized in that the transmission. The method according to claim 1 or 2, And a switching database and an intelligent network database as a database storing the subscriber's routing number. The method of claim 1, In the second process, information stored in a release message providing number portability in a 'Query on Release' method includes a number indicating a called number, a cause of call release, and a parameter indicating a number portability provision method. How to Provide. The method of claim 1, The information stored in the call setup message for transmitting the call in the first step, the third step and the fourth step includes parameters indicating the called number, the routing number, the forward call indicator, and the number portability capability. Number portability providing method characterized in that the transmission.

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