KR20000020902A - Method for converting call using call redirection request in communication network - Google Patents

Abstract

PURPOSE: A method is provided to convert a call by using a redirection request message of the call. CONSTITUTION: A method for converting a call in a communication network comprises the steps of: registering information of the other exchange having a redirection request message of a call, after composing a redirection request table to a call process of an exchange; deciding a processing state of the call redirection request message and a state of the call redirection request table; transmitting the call redirection request message to a transmitting exchange, when it is the call redirection request message-on or the table-on, and when the transmitting exchange is registered, and performing a call conversion service; transmitting a TTN(Transfer To Number) request message to an HLR(Home Location Register), when it is the call redirection request message-off or the transmitting exchange is not registered in the redirection request table, and performing a call conversion service after receiving a call transfer number.

Description

Call transfer service method using call reset request message in communication network

The present invention relates to a call transfer service method in a communication network, and more particularly, to a call transfer service method for performing a call transfer using a redirection request message in a communication network.

First, the concept of the call transfer service to be the subject of the present invention will be described.

In general, a mobile communication network provides a variety of additional services, one of which is a call transfer service. Call transfer service is a service that connects a call to another number when the subscriber does not want to call or cannot be connected. Call transfer services can be divided into several categories depending on the call transfer method.

First, there are conditional and unconditional call transfers. Conditional transfer is a service that connects to another number when the subscriber's location is not known, the subscriber does not answer a call, or is busy. Unconditional transfer is a service that connects to another number without calling the subscriber. The former is called an automatic connection service, and the latter is called a call forwarding service.

It is also classified according to where the call transfer is connected. The automatic connection service or the call forwarding service is connected to any number, while the mobile subscriber using the voice mail service (VMS) is transferred to the voice mailbox (VMS). You can establish a connection. Redirection Request messages are used for conditional call forwarding.

Conventionally, when interworking between an exchange that supports a call reset request message processing function and an exchange that does not support the above function, a call processing failure is caused and the efficiency of signal point management is inferior.

It is currently the operator's option that the switching center has a call reset request message processing function. Therefore, if the destination exchange uses the redirection request message without considering the ability of the originating exchange to handle the Redirection Request message, the message may be discarded at the originating exchange, and the call processing may be timed out at the destination exchange. TimeOut) is delayed. As a result, the call resetting request message processing function cannot be used conventionally when interworking with an international network or another network. In addition, although the incidence of the call reset request message is small, the burden of managing a large number of signal points to which a message can be transmitted is required to process the message.

Looking at the content of the prior art as described above in more detail.

First, the redirection request message processing function is important in terms of efficient use of exchange resources such as trunk efficiency, billing generation, and intelligent network implementation. However, the call reset request message processing function is defined as an option in the mobile communication network network protocol standard (IS-41), and some networks may not be implemented depending on the operator. Therefore, it can be said that it is almost impossible to interwork with exchange systems having different characteristics in the conventional manner while using the call reset request message processing function.

The conventional method cannot determine whether to perform the redirection request message processing function of the other station when the originating exchange requests the call resetting, and when the call is requested to the exchange without the call resetting request message processing function, the call is requested. It caused the processing delay. That is, when an exchange without a redirection request message processing function receives a redirection request message, it is discarded, and the exchange, which has sent the redirection request message, processes the call until a timeout occurs. Withhold.

In addition, in the related art, in order to transmit a redirection request message to a MAP (Mobile Application Part: mobile subscriber part) of a switching center, a processing station or signaling point of a called party to which a message should be transmitted must be managed. However, it was difficult to manage when the number of exchange offices increased in conjunction with other networks.

Accordingly, the present invention provides a call transfer service method capable of managing a call redirection request message generated when interworking with various exchange systems without failure by managing whether a counterpart exchange station has a redirection request message processing function. The purpose is to provide.

1 is an exemplary configuration diagram of a general mobile communication network to which the present invention is applied.

2 is a flow diagram of an embodiment of a call transfer service method using a redirection request message according to the present invention;

3 is a flow diagram of an embodiment of a call transfer service method according to the present invention when the calling exchange does not have a function of redirection request message processing.

4 is a detailed flowchart illustrating a process of determining whether to send a Redirection Request message according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: mobile communication exchange / visitor location register 12: home location register

13 base station controller 14 base station transmission and reception subsystem

15: mobile station

In order to achieve the above object, the present invention, in the call transfer service method applied to the communication network, by configuring a redirection request table (Redirection Request Table) in the call processing process of the switching center, the counterpart switching station having a call resetting request message processing function First step of registering information of the; A second step of determining a state of a call reset request message processing function and a state of the call reset request table according to a situation in which a call reset request message should be transmitted to a destination exchange station; As a result of the determination of the second step, if the call resetting request message processing function is On or Table On and the calling exchange is registered, a call resetting request message is transmitted to the calling exchange. Performing a third step; And when the call resetting request message processing function is OFF or the calling exchange is not registered in the call resetting request table, the called exchange requests the home location register to the home location register (HLR). And a fourth step of receiving a call transfer number by transmitting a (TTN) message and performing a call transfer service.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the main concept of the present invention will be described as follows.

The present invention has an ON / OFF function for selecting whether or not to use a call resetting request message processing function in a switching system, and also sets a redirection request table in a MAP processing unit to request a call resetting. After registering an exchange that can process a message, if a situation occurs that causes a call reset request message during call processing, the call reset request message processing function is turned ON, OFF, or TABLE ON. If it is ON or Table ON and the counter-exchange is registered in the call reset request table, the call reset request message is sent; otherwise, the number transfer request (Transfer to Number request). In the present invention, the signal point of the switching station having a low use frequency is excluded from the management object.

That is, in the present invention, the exchange operator can control whether to perform the redirection request message processing function divided into on / off / table on. Here, Table On refers to a system that can process a redirection request message by creating a redirection request table and managing it.

And, even if there is a situation in which the call reset request message should be transmitted, the call reset request message is transmitted only when the call reset request message processing function is on or table on and the other station exists in the table. To try.

1 is an exemplary configuration diagram of a general mobile communication network to which the present invention is applied.

Mobile communication networks generally include a home location register (HLR) 12, a mobile communication exchange (MSC) 11, a visitor location register (VLR) 11, a base station (BS) 13, 14 and a mobile station (MS) ( 15) It consists of back light and other additional equipment.

The Home Location Register (HLR) 12 is a database containing subscriber location information and additional service information, and also plays a role in controlling services. The mobile switching center (MSC) 11 connects a call when the mobile subscriber joins or receives a call, and the visitor location register (VLR) 11 is connected to the mobile switching center 11. It stores the information of subscribers in the service area.

A base station (BS) is composed of a base station controller (BSC) 13 and a base station transmit / receive subsystem (BTS) 14, and a base station controller (BSC) 13 and a base station transmit / receive subsystem (BTS). The Basestation Tranceiver Subsystem (14) is in charge of the wire / wireless interface between the mobile communication switch 11 and the subscriber. A mobile station (MS) 15 refers to a mobile subscriber having a terminal.

Usually there can be multiple home location registers (HLRs) 12 in one service network, and one or more mobile communication exchange / visitor location registers 11 in one home location register (HLR) 12. The base station (BS) 13, 14 may be connected to one mobile communication switch 11.

2 is a flowchart illustrating a call forwarding service method using a redirection request message according to the present invention.

First, when the originating subscriber attempts to make a call, the originating switching center requests routing information of the called subscriber to the home location register (HLR) to obtain the location information of the called subscriber (201). Then, the home location register (HLR) receives the routing information of the called subscriber from the called exchange station where the called subscriber roams (202, 203). After that, the routing information received from the destination exchange is returned to the source exchange (204). Then, the source switching center allocates a voice call path with the destination switching center using this routing information (205).

Here, if the called party is subscribed to the automatic connection service, and the called party does not answer or is busy while the service is active, the called party sends the Redirection Request message to the calling party. Informs the situation that the call is not answered and causes the calling exchange to perform the next operation (206). Receiving the call resetting request message, the calling exchange transmits a Transfer To Number Request message to the home location register (HLR) (207) and receives a number to transfer the call from the home location register (HLR) ( 208) 209 returns a response message (without return parameter) to the call resetting request message.

Subsequently, if the call switching center is not the current destination exchange, the calling exchange releases the voice call route allocated in the call setting process 205 and connects the call to the calling party to the auto-connection service number. While sending the announcement of the contents, the call is set up to a new destination exchange station (a destination exchange station to which the number registered by the subscriber in the automatic connection service belongs) (211).

Conventionally, when processing the call redirection request message transmission process 206, a redirection request message may be transmitted without considering the processing capability of the originating exchange, thereby causing a call processing problem. That is, if the originating exchange station does not have the capability to process the call reset request message, the message is discarded. At this time, the destination exchange will experience a call processing delay until a timeout occurs to receive the return result. As such, when the originating exchange station does not have a capability to process a call reset request message, call processing should be performed as shown in FIG. 3 below.

3 is a flow diagram of an embodiment of a call forwarding service method according to the present invention when the calling exchange does not have a function of redirection request message processing.

First, when the originating subscriber attempts to make a call, the originating exchange station requests the routing information of the called subscriber to the home location register (HLR) to obtain the location information of the called subscriber (301). Then, the home location register (HLR) receives the routing information of the called subscriber from the called exchange station where the called subscriber roams (302 and 303). Thereafter, the routing information received from the destination exchange is returned to the calling exchange (304). Then, the source switching center allocates a voice call path with the destination switching center using this routing information (305).

At this time, when the called party does not respond, the called exchange does not send a Redirection Request message to the calling exchange, but instead transfers a Transfer To Number Request message to the home location register (HLR). It transmits (306) receives the number to be transferred (307) and sets up the call (308).

However, the method shown in FIG. 3 is disadvantageous in terms of utilization of exchange resources. That is, in terms of voice call utilization, using the call route between the calling exchange and the destination exchange in the voice call allocation process 305 becomes unnecessary resource waste. If this section is between Seoul and New York, and the transferred number is Seoul again, two currency paths between Seoul and New York will be used, which is a great waste of money.

And, in terms of billing, the billing information is generated when the calling exchange performs the allocation process 305 to the voice call, but because billing information is not known, the billing information cannot be stored, and the called exchange attempts to transfer the call and creates a new billing. As a result, the waste of exchange resources and the problem of billing will be affected.

The Redirection Request message handling function compensates for the disadvantages listed above so that the originating exchange and the Home Location Register (HLR) have the authority for call handling. The destination exchange station may send a call resetting request message to inform the originating exchange of the necessity of transferring the call, and then the originating exchange may release the communication path established between the originating exchange and the destination exchange to increase the efficiency of the communication path. In terms of billing generation, the originating exchange can record in the billing information what happened during the call processing process and reduce the frequency of billing generation. In addition, it is possible to give consistency to the nodes in charge of call processing or supplementary services in the mobile communication network, and to expect the effect of evolving the network into the form of an intelligent network.

As described above, the redirection request message processing function is very useful, but it is not possible to link with other networks (domestic / foreign third-party vendors) by the conventional method. The implementation of the call reset request message processing function is defined as an option in the mobile communication network network standard (IS-41), and according to the service provider, the call reset request message processing function may not be provided. In the conventional method, even if only one provider in charge of a service does not provide this function, the call reset request message processing function cannot be used.

To solve this problem, the present invention implements an On / Off / Table On function of the call reset request message processing function in the MAP (Mobile Application Part) processing unit of the switching center. If the Redirection Request message processing function is On by the operator, the Redirection Request message processing function is used for all counterpart exchanges. If the Redirection Request message processing function is Off, the redirection request message processing function is Off. The processing function is not used. Table On can be selectively turned on for each exchange. Create a table so that the MAP processing unit can register the exchange to use the call reset request message processing function, and send only the call reset request message to the exchange registered in this table.

When a situation in which a redirection request message needs to be transmitted occurs, the redirection request message processing function is turned on or in a table on state and at the same time, when a counterpart exchange station exists in the table. As shown in Fig. 3, a call resetting request message is transmitted, and if a call is off or there is no counter exchange in the table, a call transfer attempt is attempted as shown in FIG.

4 is a detailed flowchart illustrating a process of determining whether a Redirection Request message is transmitted according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a process of processing a Redirection Request message of a counterpart station before transmitting a Redirection Request message to a counterpart. The flowchart to judge is shown.

First, when a situation in which a redirection request message needs to be transmitted occurs, it is not an unconditional transmission of the redirection request message, but the state of the redirection request message processing function is determined (401). Instead of sending the call reset request message to the other station (originating exchange), the call is transmitted by sending a number transfer request (TTN) to the home location register (HLR) (403), and the call reset request message processing function is turned on (active state). ), The call resetting request message is transmitted to the opposite station (404).

On the other hand, if the call resetting request message processing function is in the table on state, it is determined whether the calling exchange is registered in the call resetting request table (402), and if it is not registered, the call resetting request message is not transmitted to the other station (originating exchange) without the home position. A number transmission request (TTN) is transmitted to the register (HLR) to establish a call (403), and if it is registered, a call resetting request message is transmitted to the counterpart (404).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

In the present invention as described above, the destination exchange station can send a call resetting request message to inform the caller of the need to transfer the call, and then, the calling exchange station releases the communication path established between the calling exchange and the destination exchange station to the call There is an effect that can increase the efficiency.

In addition, in terms of billing generation, the originating exchange can record in the billing information what occurred during the call processing process, and the billing generation frequency can be reduced.

In addition, it is possible to give consistency to the nodes in charge of call processing or supplementary services in the mobile communication network, and to expect the effect of evolving the network into the form of an intelligent network.

In addition, the call processing delay, which is a complaint of the subscriber, can be reduced, and the signal point that does not support the call resetting request message processing function (or MSCID, etc.) can be deleted without managing the signal point management.

Claims (5)

In a call transfer service method applied to a communication network, A first step of configuring a redirection request table in a call processing process of the switching center and registering information of a counterpart switching center having a redirection request message processing function; A second step of determining a state of a call reset request message processing function and a state of the call reset request table according to a situation in which a call reset request message should be transmitted to a destination exchange station; As a result of the determination of the second step, if the call resetting request message processing function is On or Table On and the calling exchange is registered, a call resetting request message is transmitted to the calling exchange. Performing a third step; And As a result of the determination in the second step, if the call resetting request message processing function is Off or the calling exchange is not registered in the call resetting request table, the called exchange requests the number transfer request to the home location register (HLR). A fourth step of receiving a transfer number by transmitting a TTN) message and performing a transfer service Transfer service method comprising a. The method of claim 1, The second step, A fifth step of, when the calling subscriber attempts a call, the calling switching center requests routing information of the called subscriber to the home location register (HLR) to obtain the location information of the called subscriber; A sixth step of receiving, by the home location register (HLR), the routing information of the called subscriber from the called subscriber station where the called subscriber is roaming and transmitting the received routing information to the calling switching center; A seventh step of the originating exchange station allocating a call path with the destination exchange station using routing information; An eighth step of determining the state of the call resetting request message processing function when the called subscriber is subscribed to the automatic connection service and the called subscriber is not answering the call or is busy while the service is activated; A ninth step of skipping to the fourth step if the determination result of the eighth step is an off state (deactivation state); A tenth step if the determination result of the eighth step is an on state (activation state), the process proceeds to the third step; And As a result of the determination in the eighth step, if it is in the table-on state, it is determined whether the originating switching center is registered in the call resetting request table. If not, the processing proceeds to the fourth step. 11 steps Transfer service method comprising a. The method according to claim 1 or 2, The third step, The called exchange station transmitting a call reset request message to the calling exchange station; The source switching center transmits a number transmission request message to the home location register (HLR), receives a number to transfer a call from the home location register, and delivers a response message for a call reset request message to the destination switching center. step; And The call center releases the call route assigned in the step 7 of setting the call route when the call transfer location is not the current destination exchange station, and includes a number registered by the called subscriber in the automatic connection service. Fourteenth step of setting up a call to the destination exchange Transfer service method comprising a. The method of claim 3, wherein The first step is, A call resetting request message is placed in the MAP (Mobile Application Part) processing unit of the exchange station with an ON / OFF function for selecting whether to use a call resetting request message processing function. Call transfer service method, characterized in that for registering the counterpart switching center that can process. In a network with a large processor, A first function of configuring a redirection request table in a call processing process of the switching center to register information of a counterpart switching center having a call resetting request message processing function; A second function of determining a state of a call reset request message processing function and a state of the call reset request table as a situation in which a call reset request message needs to be transmitted to a destination switching center occurs; As a result of the determination in the second function, if the call resetting request message processing function is On or Table On and the calling exchange is registered, the call resetting request message is transmitted to the calling exchange. A third function of performing a service; And As a result of the determination in the second function, if the call resetting request message processing function is Off or the calling exchange is not registered in the call resetting request table, the called exchange request is made to the home location register (HLR). A fourth function of performing a transfer service by receiving a transfer number by transmitting a (TTN) message A computer-readable recording medium having recorded thereon a program for realizing this.