KR19980031555A - How to perform call transfer supplementary service in mobile communication system - Google Patents

Abstract

The present invention relates to an additional service provided to each of the mobile terminals subscribed in a GSM system of the Global System for Mobile Communications (GSM). Particularly, the present invention relates to an additional phone number in the absence of a mobile subscriber, thereby making it more reliable to subscribers. The present invention relates to a call transfer additional service implementation method in a mobile communication system providing a call service.

An object of the present invention is to allow a subscriber to select as many phone numbers as the target of the transfer service, so that the subscriber can receive a wide range of benefits of the transfer service at any place.

Accordingly, when the subscriber is absent, a number of transfer phone numbers which are the targets of the transfer service connecting the call to another phone number can be registered, thereby increasing the call success rate and improving the service utilization rate.

Description

How to perform call transfer supplementary service in mobile communication system

The present invention relates to an additional service provided to each mobile terminal subscribed to in a digital system for mobile communication (GSM) -based digital mobile communication system. The present invention relates to a call transfer additional service implementation method in a mobile communication system providing a call service.

Here, call forwarding service refers to a function of connecting to a terminal of a predetermined phone number when a call is not available when a call is attempted from a normal phone (or a mobile phone) to a mobile phone.

In addition, the GSM is not compatible with the existing analog method and is a standard for a pan-European cellular mobile phone system that emphasizes interoperability with ISDN (Integrated Services Digital Network) and is designed to allow all countries in Europe to communicate freely. It is based on future mobile cell phone service.

In general, both mobile and digital systems include a mobile terminal 1, a wireless base station 2, and a switching center 3, as shown in FIG. 1, where the home location register 4 is separately or It is comprised in the exchange station 3, and is comprised.

Here, the radio base station 2 is arranged in each cell, and each mobile terminal is subscribed to the radio base station of the cell.

The switching center 3 then checks the state of the mobile terminal 1 via the wireless base station 2 while connecting the wireless base station and the wireless base station.

The home position register 4 is a register to which user identity is assigned, and is a database storing various subscriber information necessary for mobile subscriber management by a switching center.

That is, various additional services requested by each mobile terminal are stored and provided when necessary.

Examples of additional services provided to each mobile terminal include registration, erasure, activation, and deactivation.

Among these, when the subscriber registers the transfer service as in the process of FIG. 2A, the subscriber is provided with the service in the process as shown in FIG. 2B.

Here, the call transfer service registration process will be described with reference to FIG. 2A.

When the subscriber enters the additional service registration mode through the mobile terminal 1, various registration menus are displayed. The subscriber selects a transfer service menu, which is a desired service.

Then, enter one phone number to be transferred, and press the completion button indicating that the input is complete.

In this way, the message for the various menus selected by the subscriber is transmitted to the switching center 3 via the wireless base station 2 as one data. In this case, the transmitted message includes a code for the subscriber and the service requested by the subscriber.

With this message, the switching center 3 checks whether the subscriber that is subscribed to is a signal sent by the subscriber and whether it is a service that can be provided, or notifies the mobile terminal 1 that the transmission code is an error. Is displayed.

On the other hand, if all the transmitted messages are correct, the home location register (4) transmits the subscriber and the service registration message code to register the call transfer service target phone number in the database assigned to the subscriber.

This completes the transfer service registration process.

Thereafter, the process of providing the call transfer service is performed according to FIG. 2B.

That is, when a call request is received to a subscriber who has registered a call transfer service, the call is attempted by the switching center 3 by sending a call signal to the mobile terminal 1 through the wireless base station 2.

However, in this case, when the subscriber of the mobile terminal 1 is in a situation where it cannot be received or is in a call, the switching center 3 confirms that there is no response signal from the subscriber, and determines whether the subscriber transfers the registration service of the home location register ( Check from 4).

The home location register (4) extracts a telephone number for a call transfer service from various data stored in the subscriber's database and sends it to the switching center (3).

In this way, the switching center 3 interrupts the call connection to the mobile terminal 1 and attempts to call the call transfer target phone number.

In this case, if there is no response, the switching center 3 completely terminates the call connection attempt.

In the transfer service provided as described above, only one phone number is targeted for transfer. Accordingly, the transfer service is no longer possible if the subscriber does not receive the phone that is the target of the transfer.

After all, since the number of the phone number of the transfer service is limited to one, there is a problem in the need and reliability of subscribers for the transfer service.

In order to solve the above problems, the present invention allows the subscriber to select as many telephone numbers as the target of the transfer service, so that the subscriber can receive a wide range of benefits of the transfer service even in any place. For the purpose.

In the mobile communication system according to the present invention for achieving the above object, a method for performing a call transfer additional service in a mobile communication system to transfer a call to another phone number in the absence of a subscriber to enable a call, A first step of selecting a transfer service menu and inputting several phone numbers to be transferred to the exchange office, and confirming them in the exchange office and prioritizing each telephone number and registering them in the home location register; If there is no answer signal, the exchange bureau attempts to make a call and checks whether or not the subscriber registers the transfer service from the home location register, extracts the phone number according to the priority, and tries to make a call until the call is connected. It is characterized by including two processes.

1 is a block diagram of a general mobile communication system,

2a is a flowchart of a conventional call transfer supplementary service registration operation;

2b is a flowchart of a conventional call transfer additional service providing operation;

3A is a flowchart illustrating a call transfer additional service registration operation according to the present invention;

3b is a flowchart illustrating an operation of providing an additional call transfer service according to the present invention;

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

3A is a flowchart illustrating a call transfer supplementary service registration operation according to the present invention, and FIG. 3B is a flowchart illustrating a call transfer supplementary service provision operation according to the present invention.

At this time, in order to implement the call transfer service according to the present invention, the home location register 4 of FIG. 1 needs a memory space capable of accommodating two or more telephone numbers for each subscriber.

3a, a process of selecting a transfer service menu from a mobile terminal and inputting several phone numbers to be transferred to the mobile terminal confirms this and assigns priority to each phone number to register with the home location register. The process of Figure 3b is to try to connect to the call-required subscriber in the exchange station, if there is no response signal, check the registration of the transfer service of the subscriber from the home location register and extract the phone number according to the priority It attempts to connect the call until it is connected.

The above processes will be described in more detail with reference to FIG. 1 as follows.

The call transfer service registration process will be described first with reference to FIG. 3A.

The subscriber of the mobile terminal 1 turns on the mobile terminal 1 and enters the additional service registration mode (step S1). Here, the call transfer service menu, which is a desired service menu, is selected (step S2).

Then, enter the first target phone number of the transfer (step S3).

Subsequently, the second telephone number and the third telephone number are sequentially entered in order to transfer the call (steps S4 to S5).

When the telephone numbers are all input, the completion button is pressed to inform the switching center 3 that the input is completed (steps S6 to S7).

At this time, the message sent to the switching center 3 includes a subscriber and a service request message code.

In this way, the exchange 3 receiving the message from the mobile terminal 1 interprets the message to confirm whether it is a subscriber subscribed to it or whether the message can be provided by the exchange 3 (step S8).

Here, if the message is wrong or the subscriber is wrong, the switching center 3 notifies that the transmission code is an error, and the mobile terminal 1 receives this message and displays the error status (steps S9 to S10).

On the other hand, if the subscriber confirmation is made correctly, the subscriber and service registration message code received from the mobile terminal 1 is transmitted to the home location register 4 (step S11).

In this way, the home location register 4 registers the transfer service telephone number in the subscriber's database (step S12). At this time, if there are several call transfer numbers, the subscribers are registered by giving priority to the order entered by the subscriber.

As such, when the transfer service registration is completed, the transfer service is provided as shown in FIG. 3B when the subscriber is absent.

That is, when a call connection request signal is input to the switching center 3, a call signal is sent to attempt call connection with the corresponding mobile terminal 1 (steps T1 to T2).

Here, when the subscriber of the mobile terminal 1 is absent or busy, the response signal by the subscriber is not transmitted to the switching center 3 (step T3).

In response, the switching center 3 confirms that there is no response signal and confirms using the home location register 4 whether the subscriber has registered the transfer service as an additional service (steps T4 to T5).

Accordingly, the home location register 4 searches the subscriber's database to check whether the information on the transfer service is registered, and if not, informs the switching center 3 to stop the call connection attempt. The first telephone number is extracted as priority and transmitted to the switching center 3 (step T6).

In response, the switching center 3 disconnects the call from the mobile terminal 1 and attempts to connect the call to the first telephone number transmitted (steps T7 to T8).

Here, if there is a response from the first transfer terminal, complete the transfer operation and connect the call path, but if there is no response from the first transfer terminal, confirm this and transfer the second transfer phone number to the home location register (4). Request (steps T9 to T11).

In response to the second transfer phone number from the home location register (4) and attempts to call again.

This process continues until the call connection by the transfer telephone number is made, and when the last transfer telephone number is not answered, the call connection attempt is stopped (steps T12 to T13).

As a result, when registering with the transfer service according to the present invention, the call success rate is much higher than before.

As described above, according to the present invention, since the number of the transfer phone number that is the target of the transfer service that connects the call to another phone number can be registered when the subscriber is absent, the call success rate is increased and the service utilization rate is improved.

Claims (3)

In the mobile communication system to transfer the call to another phone number in the absence of the subscriber in a call transfer additional service implementation method, A first step of selecting a transfer service menu from a mobile terminal and inputting several telephone numbers to which the transfer target is transferred; If there is no answer signal, the exchange bureau attempts to make a call and checks whether or not the subscriber registers the transfer service from the home location register, extracts the phone number according to the priority, and tries to make a call until the call is connected. Method for implementing a call transfer additional service in a mobile communication system comprising the two steps. The method of claim 1, The first process includes a first step of selecting a transfer service menu through a mobile terminal and sequentially inputting several desired transfer target phone numbers; A second step of receiving the transfer target phone number and the subscriber's code inputted in the first step from a switching center and confirming that the transmission code is correct; And a third step of prioritizing and registering the transfer target phone number in a database allocated to the corresponding subscriber, if correct in the second step. The method of claim 1, The second step includes a first step of attempting to make a call connection with a subscriber who has requested a call at the switching center; A second step of confirming registration of the transfer service from the home location register when there is no response signal from the corresponding subscriber in the first step; A third step of extracting and transferring the first target phone number of the transfer from the home location register to the switching center if the subscriber is registered in the transfer service in the second step; A fourth step of attempting a call connection with the first transfer number transmitted in the third step; If there is a response from the terminal corresponding to the first phone number to be transferred in step 4, the call is connected and no further transfer is performed, but if there is no answer, the second transfer phone number is requested again to establish a call connection. A fifth step of retrying; Call transfer in a mobile communication system comprising a sixth step of performing the same process as the fifth step in sequence for each call transfer phone number to stop the call connection if the call is not connected to the last phone number How to Implement Additional Services.