KR20030063041A - Method for controlling call forward service - Google Patents

Abstract

PURPOSE: A method for controlling incoming call forwarding is provided to forward a call correspondingly to a location of a user, and to enable selection of more than two forwarding numbers upon incoming call forwarding, thereby enhancing a success rate of a call forwarding service. CONSTITUTION: A caller MSC(10) receives a call generating message(200), and delivers a message requesting location information of an incoming MS(Mobile Station) to an HLR(Home Location Register)(20)(202). The HLR(20) delivers a routing request message to a VLR(Visitor Location Register)(40)(203). The VLR(40) forwards the routing request message to an incoming MSC(30)(204). The incoming MSC(30) delivers a response message for the routing request message to the VLR(40)(205). The VLR(40) delivers the response message to the HLR(20)(206). The HLR(20) delivers a response message for the message requesting location information of the incoming MS to the caller MSC(10)(208). The caller MSC(10) sets up a call with the incoming MSC(30)(210). The incoming MSC(30) delivers a paging signal to a BSC(Base Station Controller) including the corresponding MS(211). The incoming MSC(30) delivers a call forwarding request message to the caller MSC(10)(212). The caller MSC(10) delivers a message requesting a forwarding number to the HLR(20)(214). The HLR(20) delivers a response message for the message requesting a forwarding number to the caller MSC(10)(216). The caller MSC delivers the received response message to the incoming MSC(30)(218). The caller MSC(10) releases the call setup with the incoming MSC(30)(220). And the caller MSC(10) sets up a call to the corresponding call forwarding number(222).

Description

How to control call forwarding {METHOD FOR CONTROLLING CALL FORWARD SERVICE}

The present invention relates to a control method of a mobile communication system, and more particularly, to a method for controlling an incoming call transfer of a mobile communication system.

In general, the number of mobile communication terminal users has rapidly increased in the mobile communication field. This increase in the number of users is leading to the rapid development of the mobile communication field. Accordingly, users' desire for the quality of mobile communication services has increased. In order to satisfy the needs of users, service providers provide various additional services. One such supplementary service is an incoming call transfer service. Currently, there is a function to unconditionally divert an incoming call to a specified subscriber number when the incoming call is diverted. As shown in Table 1 below, for example, a database of subscribers in which an incoming call transfer setting and a call forwarding number currently being serviced are stored as described above may be illustrated.

With reference to Table 1, the call forwarding method will be described. When a call forwarding is performed, a call forwarding condition is satisfied, and when the call forwarding condition is set and the paging signal is sent to the called terminal, the called terminal fails to receive due to the user's circumstances. This is the case. In addition, the paging signal is received as another condition of call forwarding, but the reception fails, or the battery of the subscriber terminal is missing, or the call corresponds to the above condition.

Each field corresponding to the order shown in Table 1 indicates a user number, a call forwarding subscription bit, and a call forwarding number for each user. For example, looking at the field of turn number 1, the user number of turn number 1 is 011-111-1111, call forwarding is set, and call forward number is 016-111-2222.

Then, when the call is received to the terminal of turn number 1, look at the call forwarding process. If the call is received at 011-111-1111, which is the user number of No. 1, and the call forwarding condition as described above is satisfied, the call forwarding is confirmed by the call forwarding number 016-111-2222 when the call forwarding subscription is checked. In this case, whether or not a call forwarding subscription can be determined based on the call forwarding subscription bit. If the call forwarding subscription bit is "1", the call forwarding subscription is registered. If the call forwarding subscription bit is "1", the call forwarding subscription is not registered. The user 1 is the call forwarding service subscriber because the call forwarding subscription bit is "1". However, in the case of user 2, since the call forwarding subscription bit is "0", the call forwarding number does not exist because the user does not subscribe to the call forwarding service.

In addition, in the third field, the user 3 is a call forwarding subscribed user, so when the call forwarding request is called, the call forwarding number is 02-333-3333.

On the other hand, call processing in a mobile communication network is much affected by the wireless environment. Therefore, the subscriber may fail to receive even when the power is normally turned on. There may also be cases where the call cannot be received due to various personal reasons, such as when the subscriber is out of battery or busy. In the above case, if the incoming call is switched to only one designated number, such as an incoming call transfer method that is currently being serviced, the user may receive a call only when the user has a terminal which has been switched or located nearby. For example, if a user who is subscribed to a call forwarding designates a call forwarding number as a company number, the call is forwarded to the terminal of the user, and when the call forwarding condition is satisfied, the call forwarding is performed to the company number. Because of this, when the user is at home there is a problem that does not receive this call. In addition, as described above, because the user is not located in only one place in the company, the incoming call conversion, which enables the user to switch the call to only one number, felt the user uncomfortable.

Accordingly, an object of the present invention is to provide a method for controlling an incoming call transfer of a mobile communication system.

Another object of the present invention is to provide a method for controlling an incoming call transfer corresponding to a location of a user in a mobile communication system.

It is still another object of the present invention to provide a method of controlling two or more switching numbers to be selected when an incoming call is switched in a mobile communication system.

Another object of the present invention is to provide a method for increasing the success rate of the call forwarding service of the mobile communication system.

In the method of the present invention for achieving the above objects, in a method for controlling call forwarding of a subscriber in which call forwarding is set in a mobile communication system, a call is received by the first switching system to a mobile communication terminal in which call forwarding is set, A first process of transmitting a call forwarding request message to a second switching system if the switching condition is satisfied; and sending a message requesting a switching number to a home location register when the second switching system receives the call forwarding request message. In step 2, when the home location register receives the forwarding number request message, the home location register selects the forwarding number corresponding to the location information of the called terminal from among the forwarding forwarding numbers stored, and sends the forwarding number to the second switching system. The third process of sending a response message to the request message, and the second exchange system Receiving a response message to the call forwarding number request message, sending a response message to the call forwarding request message to the first switching system, canceling call setup, and simultaneously setting up a call to the called party number; It is done.

1 is a configuration diagram of a mobile communication system to which the present invention is applied;

2 is a flowchart of an incoming call transfer signal according to an embodiment of the present invention;

3 is a control flowchart of an originating mobile communication switch according to an embodiment of the present invention;

4 is a control flowchart of a called-party mobile communication exchange according to an embodiment of the present invention;

5 is a control flowchart of a home location register according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described in detail with respect to the process of the calling / destination mobile communication exchange and the home location register in the mobile communication system to control the incoming call transfer.

1 is a block diagram of a mobile communication system to which the present invention is applied. Hereinafter, with reference to Figure 1 will be described in detail the configuration of the mobile communication system for servicing the incoming call transfer and the operation of each configuration.

The mobile communication terminal 100 (MS) is connected to the base station 102 through an air interface when a call is established. The mobile communication terminal 100 can perform a voice call and can provide data services such as text or video. In the present invention, it is assumed that the mobile communication terminal 100 is a terminal subscribed to a call forwarding service.

The base station 102 (BTS: Base Transmit Subsystem) is connected to the base station controller 104 by wire, and is connected to the mobile communication terminal 100 through a wireless section when the call is established. When the call setup of the terminal is requested from the base station controller 104, the base station 102 transmits a paging signal to the corresponding terminal. In addition, the base station 102 transmits the call request signal from the mobile communication terminal 100 to the base station controller 104.

The base station controller 104 (BSC: Base Station Center) is connected with at least one base station. The base station controller 104 controls an overall call processing process such as a voice call, a packet call, and the like for each mobile communication terminal. In addition, the base station controller 104 performs a signaling operation with the mobile communication switch 108, and performs control such as handover of the mobile communication terminal between base stations.

Mobile communication center 108 (MSC: Mobile Station Center) includes a visitor location register 114, and may be connected through a different exchange than when connected directly with home location register 106. In the present invention, the mobile communication switch 108 is directly connected to the home location register 106. The mobile communication exchange 108 performs a call connection exchange function for processing an outgoing request from the mobile communication terminal 100 to the incoming / mobile communication terminal 100, and interworks with another mobile communication exchange network. Do this. In addition, the visitor location register 114 and the home location register 106 performs information inquiry on the subscriber. In particular, the mobile switching center 108 controls the call forwarding service according to the present invention. This will be described in more detail with reference to the control flowchart of the calling mobile communication switch of FIG. 3 and the control flowchart of the called mobile communication switch of FIG. 4 described later.

The visitor location register 114 (VLR) stores, maintains, deletes, and updates information of all mobile subscribers in the area of the mobile switching center 108 for a predetermined period of time. The mobile communication subscriber information stored in the visitor location register 114 stores location information of the subscriber station, power on / off, call forwarding number, service type of the subscriber station, and the like. The visitor location register 114 reads and stores information of the mobile communication subscriber from the home location register 106. The visitor location register 114 also provides the mobile communication subscriber's information to the mobile communication exchange 108.

The home location register 106 (HLR) is a database that stores and manages data of mobile subscribers. The home location register 106 performs location registration and deletion of subscribers and subscriber information inquiry. In addition, the visitor location register 114 provides the information when the visitor location register 114 requests the information registered in the home location register 106. Also, after confirming whether the subscriber is a normal subscriber by checking the called party terminal information, a response message for the request is sent. In particular, in the present invention, the home location register 106 stores user information and two or more call forwarding numbers corresponding to each user's location. When the home location register 106 receives the call forwarding number request, the home location register 106 selects the forwarding number corresponding to the location of the called terminal from the stored forwarding number. This will be described in more detail with reference to the control flowchart of the home location register of FIG. 5 to be described later.

For example, the home location register 106 may show a database of subscribers storing two or more call forwarding numbers according to whether or not the incoming call is set up and the location of the called terminal, as shown in Table 2 below.

Looking at the field of the sequence number 1 shown in Table 2, the user number of the sequence number 1 is 011-111-1111, and the call forwardable number is 02-222-2222, 032-333-3333, 031-444- 4444 can be set. Call forwarding may be performed by selecting the called number corresponding to the location of the terminal among the forwarding numbers.

The method of selecting the call forwarding number corresponding to the location of the mobile communication terminal is as follows.

When the mobile communication switch 108 sends an incoming call transfer number request (TTNR) message to the home location register 106, it sends the current location information of the called party together. The home location register 106 selects the corresponding forwarding number in the case of location information that matches the Zone Key value stored in the database of the home location register 106 based on the current location information of the called subscriber. It also sends the selected forwarding number to the mobile switching center 108. However, if the current location information of the called subscriber and the Zone Key value stored in the database of the home location register 106 do not match, the incoming call is switched to the existing preset call forwarding number.

When the home location register 106 receives a call forwarding number request according to an embodiment of the present invention with reference to <Table 2>, the call forwarding number is selected by selecting the call forwarding number so as to correspond to the location of the called terminal. Explain about.

Then, when the call is received to the terminal of step 1, the call forwarding process will be described.

If the call is received at 011-111-1111, which is the user number of No. 1, and the subscription is confirmed as described above, and the call forwarding condition is satisfied, the location information of the terminal among the stored two or more call forwarding numbers; Call forwarding is performed with the corresponding call forwarding number. If the called terminal is in Seoul, the call is forwarded to 02-222-2222, if it is in Incheon, the call is forwarded to 032-333-3333, and if it is in Suwon, the call is forwarded to 031-444-4444.

That is, an incoming call forwarding number is selected by the home location register 106 by the current location of the called subscriber and forwarded to the mobile communication switch 108. Therefore, the incoming call can be selectively switched by the location information of the called subscriber.

The information should also be used when registering the incoming call forwarding number in the home location register 106 based on the subscriber location information stored in the mobile communication exchange 108. Therefore, when there is a home and an office in another cell, the incoming call can be switched. However, if there is a home and an office in the same cell, it is impossible to transfer the incoming call.

However, when the incoming call transfer is impossible because the location corresponding to the incoming call transfer number is located in the same cell, the incoming call transfer is possible by using a network component called LBS (Location Base System). The LBS (Location Base System) is a network component currently under development, and is linked to a mobile communication network to receive more detailed location information from the LBS (Location Base System) to service the incoming call.

Public switched telephone network (PSTN) is a communication network that provides voice data and exchange services by connecting users' telephones through an exchange. Basically, it supports voice information exchange service for general home telephone use. Various data communication services also use the public telephone network 110.

The mobile communication network 112 is a communication network in which a plurality of the mobile exchanges described above are connected. In the present invention, the destination mobile communication network and the source mobile communication network are assumed to be the same mobile communication network.

In FIG. 1, a packet network or an Internet network may be connected to the mobile communication switch 108, the public telephone network 110, and the mobile communication network 112, but the description thereof will be omitted.

2 is a flowchart illustrating an incoming call transfer signal according to an embodiment of the present invention. Next, a flow of a signal for transferring an incoming call according to an embodiment of the present invention will be described in detail with reference to the configuration diagram of the mobile communication system of FIG. 1.

The calling mobile communication switch and the called mobile communication switch in FIG. 2 will be described in the case of the same service provider.

In step 200, the calling party mobile communication exchange 10 receives a call origination message including the number of the called party mobile communication terminal. In step 202, the calling mobile communication exchange 10 sends a called terminal location information request message including the number of the called terminal to the home location register 20 in order to check the location information of the called mobile communication terminal.

The home location register 20 receiving the called terminal location information request message checks whether the called terminal is a normal subscriber. If the check result is a normal subscriber, in step 203, the home location register 20 sends a routing request message to the visitor location register 40 in the called party's mobile communication exchange 30. Here, the Routing Request message is used to query an appropriate method for routing a call to the terminal.

The visitor location register 40 which has received the routing request message in step 204 switches the routing request message to the current called party's mobile communication exchange 30. In step 205, the called-party mobile communication exchange 30 assigns a Temporary Local Directory Number (TLDN) and sends a response message to the visitor location register 40 to a routing request message including the temporary number. send. The temporary number is used to reduce the traffic load. In step 206, the visitor location register 40 receiving the response message to the routing request sends the response message to the home location register 20.

The home location register 20 that has received the response message for the routing request message sends a response message for the called terminal location information request message to the calling-party mobile communication switch 10 in step 208. In this case, the response message to the called terminal location information request includes routing information in the form of a termination list parameter.

In step 210, the calling mobile communication exchange 10 receiving the response message to the called terminal location information request message sets up the call to the called mobile communication exchange 30.

When a call is established between the calling mobile communication switch 10 and the called mobile communication switch 30, the called mobile communication switch 30 transmits a paging signal to the base station controller to which the corresponding mobile communication terminal belongs in step 211. ). The base station controller controls the base station controller to transmit a paging signal to the base station to identify the location of the incoming mobile communication terminal. Since the corresponding mobile communication terminal continues to scan the paging signal of the base station, when its number is called, it responds that it has received the call to the nearest base station. The base station controller controls to assign a channel to the base station. The mobile communication terminal notified of the channel assignment generates a ring signal.

On the other hand, there is no response to the paging signal (paging signal) or the response signal to the paging signal (paging signal) of the called party mobile communication switch 30, the call transfer, such as when the subscriber does not respond If the condition is met, step 212 is performed.

In step 212, the called-party mobile communication exchange 30 sends a call forwarding request message to the calling-party mobile communication exchange 10 requesting that the call be connected again. At this time, the called party mobile communication exchange 30 sends the message including the location information of the called terminal in the visitor location register 40 to the call forwarding request.

Upon receiving the message for requesting the call forwarding, the calling mobile communication exchanger 10 sends a switch number request message for requesting the change number to the home location register 20 in step 214. At this time, the location information of the called terminal received from the called-party mobile communication exchange 30 is included in the message for requesting the change number.

The home location register 20 that receives the switch number request message determines the switch number corresponding to the location information by using the location information of the called subscriber. In step 216, the home location register 20 sends a response message to the calling mobile communication switch 10 including the determined switching number.

In step 218, the calling mobile communication switch 10 sends a response message to the called mobile communication switch 30, which is received in step 212. In step 220, the calling mobile communication switch 10 terminates the call setup with the called mobile communication switch 30.

Simultaneously with the call setting termination, the calling mobile communication switch 10 may set the call to the corresponding call forwarding number using the call forwarding number corresponding to the location information of the called terminal received in step 216. . In addition, after canceling the call setup, step 222 may be performed.

The above-described signal flow processes of FIG. 2 have described the case where the calling mobile communication switch 10 and the called mobile communication switch 30 are different in the same operator.

If the calling mobile communication exchange 10 and the called mobile communication exchange 30 are the same, if a call origination message is received by the same mobile communication exchange, the call is established in step 210. After setting up the call, the same mobile communication exchange requests the visitor location register 40 for the transfer number corresponding to the location of the called terminal when the call transfer condition is satisfied. In this case, the visitor location register 40 may be able to store multiple conversion numbers. If not, the conversion number request to the home location register 20 as in step 214. When the switch number is received by the mobile communication switch, the mobile communication switch sets a call to the terminal corresponding to the switch number. Here, although the conversion number corresponding to the positional information as shown in Table 2 in the home location register 20 has been described, the visitor location register 40 may be used. In this case, steps 218 and 220 of the signal flow process of FIG. 2 may be omitted.

On the other hand, when the call origination message is received in the trunk line switching network or other service provider network in step 200 of FIG. 2 when the calling mobile communication switch 10 and the called mobile communication switch 30 is different from the FIG. It is performed as a signal flow diagram. In addition, when the calling mobile communication exchange 10 and the called mobile communication exchange 30 are the same, step 218 and step 220 may be omitted in FIG. 2.

3 is a control flowchart of an originating mobile communication exchange according to an embodiment of the present invention. 2 will be described in detail with reference to the incoming call switch signal flow chart of Figure 2 described above in detail the control process of the calling party mobile communication switch for switching the incoming call according to an embodiment of the present invention.

The calling mobile communication exchange 10 maintains the standby state in step 300. Here, the waiting state is a state waiting for receiving a call occurrence message from the calling terminal. In step 302, the calling mobile communication switch 10 checks whether a call origination message has been received from the calling terminal. If the call result message is received as a result of the check proceeds to step 304, otherwise proceeds to step 300 to maintain the standby state. At this time, the received call occurrence message includes the called party's terminal number.

In step 304 where the call origination message is received, the calling party mobile communication exchanger 10 sends the called party location information request message to the home location register 20 to check the location information of the called party mobile communication terminal. This corresponds to step 202 of FIG.

Proceeding from step 304 to step 306, the calling mobile communication exchange 10 checks whether a response message for the called terminal location information request is received from the home location register 20. If the response message is received as a result of the check proceeds to step 308, otherwise waits for the reception of the response message.

As shown in step 210 of FIG. 2, in step 308, the calling mobile communication exchange 10 receiving the response message for the called terminal location information request establishes a call to the called mobile communication exchange 30.

When the call is established, the calling mobile communication exchange 10 checks whether the call path is connected. If the call path is established, proceed to step 312 to perform a normal call mode. The "normal call mode" refers to a general terminal control procedure for enabling a call.

On the other hand, in step 314 in which the call path is not connected, the calling party mobile communication switch 10 determines whether a message for requesting call forwarding including the location information of the subscriber from the called party mobile communication switch 30 has been received. Check it. If the message requesting the call forwarding is received, the process proceeds to step 315. The received message carries the location information of the called terminal in the called party visitor location register 40. This corresponds to step 212 of FIG.

If the call forwarding request message is not received, the process proceeds to step 320 to check whether the call setup is terminated. If the check result is terminated, the process is terminated. If the call setting is not terminated, the process proceeds to step 310 and checks whether the call path is connected again.

In step 315 in which the call forwarding request is received and proceeded as in step 214 of FIG. 2, the calling mobile communication exchange 10 sends a message requesting a forwarding number to the home location register 20. At this time, the message for requesting the switching number includes the location information of the called terminal received from the called mobile communication switch 30.

In step 316, the calling mobile communication switch 10 checks whether a response message for the switch number request has been received. If the response message for the switch number request is received, the calling mobile communication exchange 10 sends a response message for the call forwarding request to the called mobile communication exchange 30 in step 317. This corresponds to step 218 of FIG. In addition, in step 220 of FIG. 2, the call setup set in step 308 is canceled and the process proceeds to step 318.

If a response to the call forwarding number request is not received from the home location register 20 in step 316, the receiver waits for reception.

In step 318, when the call forwarding number request response is received by the calling party mobile communication exchange 10, the calling party mobile communication switch 10 connects the call to the switch corresponding to the call forwarding number. This corresponds to step 222 of FIG.

4 is a control flowchart of a called mobile communication switch according to an embodiment of the present invention. Next, a process of controlling a called-party mobile communication switch for switching incoming calls according to an embodiment of the present invention will be described in detail with reference to the incoming call switching signal flowchart of FIG. 2.

The called mobile communication switch 30 maintains the standby state in step 400. At this time, the waiting state is a state waiting for the reception of a routing request message from the home location register 20.

In step 402, the called party mobile communication exchange 30 checks whether the routing request message is received by the visitor location register 40. If the routing request message is received, the process proceeds to step 404, otherwise it maintains the standby state in step 400. The routing request message includes a called party terminal number. This corresponds to step 204 of FIG.

In step 404, when the routing request message is received, the called-party mobile communication exchange 30 allocates a temporary local directory number (TLDN). Send a response message to the visitor location register 40 in response to a routing request including the assigned temporary number (TLDN).

In step 404 to step 406, the called-party mobile communication exchange 30 checks whether a call is set up from the calling-party mobile communication exchange 10. If the call is not set, the process waits until the call is set, and if the call is set, step 408 is performed. In step 408, the called-side mobile communication exchange 30 sends a paging signal to the corresponding terminal. The process of sending the paging signal will be described in more detail below.

When the calling mobile communication exchange 10 and the called mobile communication exchange 30 are connected, the called mobile communication exchange 30 sends a paging signal to the base station controller to which the corresponding mobile communication terminal belongs. The base station controller controls to transmit a paging signal to the base station to confirm the location of the incoming mobile communication terminal. Since the corresponding mobile communication terminal continues to scan the paging signal of the base station, when its number is called, it responds that it has received the call to the nearest base station. The base station controller controls to assign a channel to the base station. The mobile communication terminal notified of the channel assignment generates a ring signal. Performing the above procedure is a process of sending a general paging signal.

In step 410, the called-party mobile communication exchange 30 checks whether there is a response to the paging signal from the corresponding terminal. If there is a response from the corresponding terminal to the paging signal, the process proceeds to step 412 to perform a normal call mode. The "normal call mode" is the same as the general call mode described with reference to FIG. 3.

In step 414, when there is no response to the paging signal, the called-side mobile communication exchange 30 checks whether the corresponding terminal is a call forwarding subscriber. If the call forwarding subscriber is not terminated, and if the call forwarding subscriber, the process proceeds to step 416 to check whether the call forwarding conditions of the corresponding terminal is satisfied. If the call forwarding condition is not satisfied, the terminal terminates.

In step 418, which is performed by satisfying the call forwarding condition, the called party mobile communication exchange 30 requests a call forwarding request notifying that the call is to be reconnected to the calling party mobile communication exchange 10. In this case, the call forwarding request message carries the location information of the called terminal in the called party visitor location register 40. This corresponds to step 212 of FIG.

In step 420 corresponding to step 218 of FIG. 2, the called-party mobile communication exchange 30 checks whether a response message for the call forwarding request is received. If a response message for the call forwarding request is received, the process proceeds to step 422; otherwise, it waits for receiving the response message for the call forwarding request.

In step 422, the called-party mobile communication exchange 30 terminates call setup with the calling-party mobile communication exchange 10 and ends.

5 is a control flowchart of a home location register according to an embodiment of the present invention. Next, a process of controlling a home location register for transferring an incoming call according to an embodiment of the present invention will be described in detail with reference to the incoming call transfer signal flow chart of FIG. 2.

The home location register 20 is in a standby state at step 500. Here, the waiting state is a state waiting for a message requesting the destination terminal location information from the calling mobile communication switch 10. In step 512, the home location register 20 checks whether a message requesting destination terminal location information is received. When the message requesting the called terminal location information is received, the process proceeds to step 514; otherwise, the process proceeds to step 524.

In step 514, the home location register 20 checks whether the called terminal is a normal subscriber. If the check result is not a normal subscriber, the process proceeds to step 516 to perform an abnormal subscriber mode. Since the "abnormal subscriber mode" means that the called terminal is not a normal subscriber, the home location register 20 transmits a message indicating that the location information of the called terminal cannot be confirmed to the calling mobile communication exchange 10. Procedure.

In step 518, when the called terminal is a normal subscriber, the home location register 20 sends a routing request message to the called visitor location register 40 where the called terminal is registered. This corresponds to step 203 of FIG. 2. The Routing Request message is used to query the appropriate method for routing a call to the terminal.

The home location register 20 which sent the routing request message checks whether a response message to the routing request has been received in step 520. Operation 520 corresponds to operation 206 of FIG. 2. If a response message for the routing request is received, the process proceeds to step 522; otherwise, it waits for a response message for the routing request to be received.

In step 522, the home location register 20 sends a response message to the called-party mobile communication exchange 10 to the destination terminal location information request. In this case, the response message to the called terminal location information request includes routing information in the form of a termination list parameter. This corresponds to step 208 of FIG.

In step 512, the home location register 20 checks whether the called terminal location information request has been received, and if the called terminal location information request is not received, proceeds to step 524. In step 524, the home location register 20 checks whether a message for requesting a call forwarding number is received from the calling mobile communication switch 10. If the message for requesting the call forwarding number is received, the process proceeds to step 526, otherwise proceeds to step 500 to maintain the standby state. The requesting of the conversion number corresponds to the step 214 of FIG. 2.

In step 526, when the home location register 20 receives the call forwarding number request, the home location register 20 determines the call forwarding number corresponding to the location information of the called terminal included in the received call forwarding number request message.

In step 528, the home location register 20 includes the determined call forwarding number in a response message to the call forwarding number request and sends it to the calling party mobile communication switch 10. This corresponds to step 216 of FIG.

On the other hand, in the above embodiment, the case of controlling the incoming call switching is described as an example of a case where the calling party and the called party are between the same service providers. Can be performed.

In the foregoing detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention has an advantage of showing an improved call completion rate because the mobile communication subscriber receives the incoming call transfer service determined according to the location. In addition, subscribers have the advantage of increasing the success rate of the call forwarding service, because the incoming call is switched to the general landline telephone subscriber or other mobile communication subscribers where they are currently located even if they are currently unable to receive.

Claims (6)

A method of controlling a call forwarding of a subscriber in which call forwarding is set in a mobile communication system, The first switching system includes a first process of transmitting a call forwarding request message to the second switching system when a call is received to the mobile communication terminal to which the call forwarding is set and the call forwarding condition is satisfied; The second switching system transmits a message requesting a switching number to a home location register upon receiving the call forwarding request message; When the home location register receives the forwarding number request message, the home location register selects the forwarding number corresponding to the location information of the called terminal from among the forwarding forwarding numbers stored and stores the forwarding number request message to the second switching system. A third step of sending a response message, When the second switching system receives the response message for the switch number request message, the second switching system sends a response message for the call forwarding request message to the first switching system, terminates call setup, and simultaneously sets up a call to the called number. An incoming call transfer control method in the mobile communication system, characterized in that the fourth process. The method of claim 1, wherein the call forwarding condition is When the incoming call fails when the paging signal is sent to the called terminal because the call is set, or when the incoming call fails when the paging signal is received or when the subscriber terminal is powered off or when the subscriber terminal is busy. Incoming call switching control method in the mobile communication system characterized in that. In the call switching control method of the mobile communication switching system that performs the control of the call, the destination mobile communication terminal is not included in the area of the base stations connected to the mobile communication switch, Sending a request message to the home location register when a call forwarding request message is received; Sending a response message for the incoming call request message to the mobile communication exchange to which the mobile communication terminal to which the call is received when receiving a response message to the call request number, and terminates the call setting and at the same time the call number Call switching control method in the mobile communication switching system characterized in that the process of the call setup. In a mobile communication system consisting of a home location register capable of storing at least two forwarding numbers, and mobile communication switching systems capable of performing call forwarding control, the mobile communication terminal to which a call is received belongs to a mobile communication switch. In the switching control method, A first step of sending a call forwarding request message to a mobile communication exchange that is not included in the area of the base stations connected to the mobile communication exchange when the call forwarding condition is satisfied after the incoming attempt; And a second process of receiving a response message for the call forwarding request message and a message for canceling call setup. The method of claim 4, wherein the call forwarding condition is When the incoming call fails when the paging signal is sent to the called terminal because the call is set, or when the incoming call fails when the paging signal is received or when the subscriber terminal is powered off or when the subscriber terminal is busy. Switching control method of an incoming call in the mobile communication switch. If the call forwarding is set to the mobile communication terminal set to the call forwarding conditions when the call forwarding conditions are provided with a mobile communication switch that can perform the call forwarding control, registration information of the mobile communication terminals, call forwarding setting information and A method for providing a call forwarding number in the home location register of a mobile communication system, comprising: at least two call forwarding numbers and a home location register for storing location information of the mobile communication terminal when setting up call forwarding; Selecting the forwarding number corresponding to the location information of the called terminal from among the stored forwarding forwarding numbers upon receiving the forwarding number request message; And forwarding the forwarding number to the requesting system by including the selected forwarding number in a response message. 10. The method of claim 1, wherein the home location register of the mobile communication system is provided.