KR20020024479A - Method for image transmission service to aid receiver's recognization of caller in mobile communication system - Google Patents

Abstract

PURPOSE: A method of giving a video phone service for identifying a caller in a mobile communication network is provided to supply a caller's image to a receiver regardless of caller's intention, when the receiver requests the video service for caller identification, so that the receiver can decide whether to receive a call by identifying the caller's image as well as securing privacy while calling a video phone. CONSTITUTION: If a caller attempts a call to a receiver who is registered in a video phone service, a video phone service system transmits a ring signal sound to the receiver's terminal by processing the call. If the receiver recognizes the ring signal sound and selects an image preview function to transmit an image preview request, the system generates an image signal of the caller to make the receiver preview the caller's image. The system transmits a pseudo ring back tone to the caller while the receiver watches the image signal of the caller, and connects the call or connects the caller to a voice mail system, according to a DTMF signal generated when the receiver decides to receive the call or refuses the call by pressing a connect order button or a connect refuse button.

Description

Method for image transmission service to aid receiver's recognization of caller in mobile communication system}

The present invention relates to a video service of a telecommunications network. In particular, when IMT-2000 receives a caller's identity confirmation to ensure his privacy during a video call, the caller's video is received regardless of the caller's intention. The present invention relates to a video service method for identification of a caller of a mobile communication network, which enables a receiver to confirm a caller's identity and determine whether or not to make a call before a call is started.

In general, with the development of mobile communication services, services that provide various functions such as IMT-2000 have recently been realized. In particular, since IMT-2000 can transmit high speed and high quality data to subscriber's terminal using satellite communication technology, not only voice communication or text message transmission but also real time transmission of video signal is possible.

In the case of the conventional voice communication or text message transmission service, the receiver could check the caller's voice or check the caller's reply number transmitted along with the text message to determine whether to answer the call or not.

So if the call was unnecessary, the caller could stop the call.

In some cases, the caller's number display service provided by the mobile communication service provider may be used to determine whether the call is made by checking the caller's phone number before the call is answered.

In the case of the conventional mobile communication service, the caller ID display service was possible because the video signal was not exchanged between the sender and the receiver. However, in the case of the IMT-2000, the caller identification service by another method is not available. Only if provided can the privacy of the recipient be guaranteed.

Techniques applicable to the conventional IMT-2000 include a calling party number service and a calling party identification service that transmits a predetermined video signal registered in advance by the corresponding caller to the called party when the caller receives a call to determine the call status of the called party.

However, the conventional technology exemplified above has a disadvantage in that it is difficult for the receiver to grasp the identity of the caller as a caller-oriented service.

That is, when only the caller's telephone number is provided, it is not known whether the user of the calling terminal is a suitable person to answer the call.

In addition, the caller identification service that provides a constant video signal is associated with the caller's terminal phone number and the image transmitted, and the video signal is transmitted when the terminal is called, so the identity of the person using the current terminal is real-time. There was a problem that can not be identified.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to request the identity of the sender to ensure the privacy of the recipient during the video call in a mobile communication network such as IMT-2000. In this case, the video service method for the caller identification of the mobile communication network is provided so that the caller's video is provided to the receiver irrespective of the caller's intention, so that the receiver can confirm the caller's identity and determine whether or not to call before the call is started. To provide.

In order to achieve the above object, the video service method for identification of a caller in a mobile communication network according to the present invention is characterized in that, when there is a caller's call, when the called party is a legitimate subscriber to the videophone service, the transmitting control station selects the receiving terminal. Paging to transmit a ring tone to the receiving terminal; When the receiver recognizes the ring tone and selects a specific button on the terminal to request a video preview service, the receiving exchange activates the video preview service; After the video preview service is activated, as the receiver sees the video signal of the caller and decides whether to use the terminal, the receiving exchange performs a step of connecting the receiver and the caller or connecting the caller to the receiver's voicemail. It is characterized by the technical configuration.

1 is a flowchart of a video service method for verifying caller identity in a mobile communication network according to an embodiment of the present invention;

2 is a signal processing flowchart in a system to which the method of FIG. 1 is applied;

3 is a flowchart of a video service method for calling party identification in a mobile communication network according to another embodiment of the present invention;

4 is a signal processing flowchart in a system to which the method of FIG. 3 is applied.

Hereinafter, the configuration and operation of the present invention will be described in detail according to an embodiment according to the technical spirit of the video service method for caller identification of the mobile communication network.

First, FIG. 1 is a flowchart of a video service method for identification of a caller in a mobile communication network according to an embodiment of the present invention, FIG. 2 is a signal processing flowchart in a system to which the method of FIG. 1 is applied, and FIG. FIG. 4 is a flowchart illustrating a video service method for verifying caller identity of a mobile communication network according to another embodiment, and FIG. 4 is a signal processing flowchart of a system to which the method of FIG. 3 is applied.

In an embodiment of the present invention shown in FIG. 1, if there is a caller's call to the receiver side subscribed to the video telephone service, the call processing is performed to transmit a ring tone to the receiving terminal (ST11 to ST13); ; Receiving a ringing tone by a receiver subscribed to the video preview service, selecting a video preview function and issuing a video preview request (Preview_Request) to preview the sender's video signal (ST14 to ST16); The receiver sends a pseudo ringback tone to the caller while viewing the caller's video signal, and connects the caller or voices the caller as the receiver decides to press the call button (Connect_Order) or the Connect_Refuse button. Steps ST17 to ST23 are performed.

And another embodiment of the present invention shown in Figure 3, step (ST31 ~ ST33) to perform the call processing to send the ring tone to the receiving terminal when there is a caller's call to the receiver side subscribed to the video telephone service; Recipients subscribed to the video preview service recognize the ringing tone, select the video preview function using the call button, and issue a Connect_Order signal so that the video signal of the caller can be previewed by the receiver and the video of the receiver The signal is made invisible to the caller (ST34 to ST36); When the receiver sees the caller's video signal and decides whether or not to make a call and presses a certain key, the caller connects the caller or connects to the voicemail box according to the DTMF signal by pressing the key (ST37 to ST43).

The operation of the method configured as described above is as follows.

The present invention allows the receiver to receive the video signal of the other party first and then confirm the identity of the other party regardless of the intention of the caller, such as the principle used in the video door phone in the IMT-2000, and then determine whether to connect the call.

In order to perform this function, the present invention changes some of the software in the exchange and the terminal call processing process.

That is, the present invention is a process of processing a video preview request (Preview_Request) message, a process of processing a call connection rejection (Connect_Refuse) message, a process of processing a pseudo ringback tone (Pseudo RingBack Tone), the operation of the terminal and the operation of the exchange, etc. Will change.

The video preview request signal (Preview_Request) is a signal for requesting a preview of the caller video signal, and is transmitted from the terminal to the exchange. At this time, since the request signal is an uplink signal, it does not affect a terminal without an image preview request function.

The connect_refuse signal is a signal used when the receiver selects to reject a call after performing a video preview, and is transmitted from the terminal to the exchange. Since the connection rejection signal is also a higher connection signal, it does not affect a terminal without a call connection reject function.

In addition, pseudo ring back tone is a virtual ringback tone transmitted from the exchange to the caller side to make the caller appear to be waiting for a call while the receiver performs the caller's identification. The pseudo ringback tone is delivered to the originator through a traffic channel at the receiving exchange.

The terminal has a special key function for selecting an image preview, and when the special key is selected, the terminal transmits an image preview request (Preview_Request) message to the exchange. At this time, the terminal should be able to display the signal received at the exchange until the call is pressed after selecting the image preview function to perform the image preview on the receiving side.

On the other hand, the exchange should be provided with a function to process the video preview request. That is, the receiving side exchange receiving the video preview request from the receiving side has a function of transmitting the same call processing message to the calling side exchange when the called party presses a call button to transmit the calling party's video signal to the receiving side.

At this point, the pseudo ringback tone is transmitted through the traffic channel so that the caller can regard the call as continuously connected. The calling exchange recognizes the call connection state and transmits the caller's video signal to the receiving terminal via the receiving exchange.

Therefore, when the receiving side presses the call button and the Connect_Order is received, the exchange stops transmitting the pseudo ringback tone and performs the call connection between the calling side and the receiving side. On the other hand, when the receiver rejects the call and receives Connect_Refuse, the receiver disconnects from the receiver and connects the caller to the voicemail.

In the present invention, instead of changing the function of the exchange, the caller may be connected to the exchange after implementing the caller identification control station performing the function required by the exchange.

The present invention presented above is described in more detail.

In Fig. 1 and Fig. 2, when the caller attempts to designate the callee (ST11), the receiving switching center (MSC) checks whether the caller is subscribed to the videophone service, thereby making a general voice call for the subscriber. Although a voice call process is performed (ST12), when a receiver is subscribed to a video call service, a call processing process for a video call service is performed, but the present invention is applied to this process.

If it is confirmed that the called party is subscribed to the video telephone service (ST12), the switchboard (MSC) performs a call setup operation and rings the ringing tone to the receiving terminal by paging through the base transceiver station (BTS). To transmit (ST13).

The receiver, upon recognizing a ring tone for notifying the call arrival of the terminal, selects an image preview function using a special key (ST14). The special key is assigned to a specific button on the terminal for the video preview selection when the call is called, it is possible to determine that the video preview function is selected when the corresponding key is pressed.

When the receiver selects the video preview function, the terminal transmits a video preview request signal to the receiving exchange. Then, the receiving side exchange (MSC) checks whether the receiver is a legitimate subscriber of the video preview service (ST15).

In the case where the receiver selects the video preview function (ST14) and when the receiver is not subscribed to the video preview service (ST15), the call is received without performing the first step for providing the video preview to the receiver. It is treated like a call.

In general call processing, the call is available only when the call button on the terminal is pressed. Thus, when a call is answered at the receiving end, a call connection is immediately established between the calling party and the receiving party.

On the contrary, when it is confirmed that the subscriber requesting the video preview is a legitimate service user, the receiving side exchange (MSC) sends a pseudo ring back tone along with a connect_order signal through the calling side exchange. Will be sent to the terminal.

The calling terminal receives the connect_Order signal, transmits the calling video signal to the receiving terminal, and receives the pseudo ringback tone from the exchange through the traffic channel. As a result, the video signal of the receiver is transmitted to the receiver without being transmitted to the sender, thereby enabling the preview of the video (ST16).

That is, while the video preview is performed, the receiving exchange notifies that the receiving side is not in a call connection state by continuously transmitting a pseudo ringback tone through the traffic channel while being connected to the caller's terminal.

The receiver who has selected the video preview function determines whether to talk after checking the video signal of the other party (ST17). When the receiver approves the call to the caller, by pressing the call button of the terminal, a call connect (Connect_Order) signal is transmitted to the exchange (ST18).

The receiving exchange receiving the Connect_Order signal of the terminal stops the transmission of the pseudo ringback tone and transmits the video signal of the receiver to the calling terminal (ST19). As a result, a video connection between the calling party and the receiving party through the traffic channel is enabled in both directions (ST20).

On the other hand, when the receiver rejects the call, the call termination button (End button) or a specific button of the terminal is pressed to transmit a call rejection (Connect_Refuse) signal to the receiving side exchange (ST21). The MSC receiving the Connect_Refuse signal stops the transmission of the pseudo ringback tone to the caller, releases the caller's call (ST22), and then connects the caller to the receiver's voicemail box (ST23). ).

One embodiment of the present invention has been described above, another embodiment of the present invention will be described with reference to the accompanying drawings.

3 and 4 show another embodiment of the present invention, the embodiment presented therein is different from the above-described embodiment of the present invention in configuration and operation, and thus will be described based on differences therebetween.

First, unlike the step (ST14) of transmitting a video preview request (Preview_Request) using the 'specific button' when selecting the video preview function at the time of the call, here the call connection using the 'call button' on the terminal ( Connect_Order) or not (ST34).

Therefore, when the call button is pressed at the receiving terminal when the call connection (Connect_Order) is selected, the video preview function is automatically selected. In this case, the operation of determining whether the mobile communication provider subscribes to the service through the exchange should be included. If the receiver is not subscribed to the video preview service, the call is treated as a general call (ST35).

At this time, the MSC, which receives the Connect_Order signal from the receiving terminal, transmits the Connect_Order signal and pseudo ring back tone to the calling terminal so that the caller's video signal is received. The operation transmitted to the receiving terminal is the same as described above (ST36).

However, in the present embodiment, by pressing the call button on the receiving terminal, the call connection (Connect_Order) signal is transmitted to the receiving exchange, and the call is already connected from the viewpoint of call processing, and the receiver of the receiver subscribed to the video preview service. In this case, the call is available only after the video preview. In this case, therefore, a function is required in which the receiving terminal or the receiving exchange does not transmit the traffic or video signal of the receiver to the calling party.

That is, when performing image preview, the receiving side video signal should be transmitted only to the receiving side exchange or blocked by the receiving side video signal by software using an application program built in the receiving terminal. The need for these functions can be achieved simply by updating the program.

And the determination of whether or not the call of the receiving terminal is performing the video preview using DTMF (Dual Tone Multi Frequency) used during the call (ST37 ~ ST43). That is, since a call is already connected between the calling party and the receiving party performing the video preview, it is possible to determine whether a call is made without inserting an additional call processing signal using DTMF.

Determining whether to call using the DTMF is that when the receiver presses a special key for call connection on the terminal (ST38), the DTMF corresponding to the special key is transmitted to the receiving side exchange (MSC). The receiving side exchange (MSC) receiving the DTMF for the call connection stops the transmission of the pseudo ringback tone and transmits the video signal of the receiving side to the calling terminal, thereby switching to the call connection state where two-way call is possible (ST39 ~ ST40). .

When the receiver presses a special key for rejecting a call on the terminal (ST41), the receiving exchange (MSC) receiving the DTMF of the special key releases the call of the receiving party and transmits a pseudo ringback tone to the calling party. It stops (ST42). The receiving exchange then connects the sender to the recipient's voicemail (ST43).

In the present embodiment, when the caller is called, the video preview function is performed while the receiver is connected to the caller. Therefore, even if the caller is a third party subscriber, the receiver can verify the caller's identity regardless of the sender's intention. Make sure

Problems associated with the above advantages include the possibility of disputes due to billing problems between mobile operators. That is, even though the caller cannot make a call, the exchange may determine that the caller is connected to the receiver and proceed with a counter for billing. Will be done.

As described above, the present invention enables the receiver to recognize the caller in advance and determine whether or not to talk after confirming the video signal of the caller in advance in providing the IMT-2000 service, thereby allowing the receiver to selectively answer the caller. The privacy of the mobile subscriber can be guaranteed.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments.

That is, the method proposed by the present invention is not limited to the IMT-2000 service, but can be applied to a video telephony service in which a video exchange between a caller and a receiver is performed by a simple modification by a person skilled in the art.

Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the video service method for identification of the sender of the mobile communication network according to the present invention, unlike the prior art, at the receiver side, the user first looks at the sender's video signal in a state in which the video signal is not transmitted. In this case, the receiver can determine whether to answer the call while ensuring the privacy of the receiver.

In case of determining whether to call using DTMF, the video signal on the receiver side is blocked and the video signal on the receiver side is transmitted to the receiver in the already connected state without adding the call processing step. There is an effect that can provide a video preview service to.

Claims (7)

If the called party is a legitimate subscriber to the video telephone service when there is a caller's call, the transmitting control station paging the receiving terminal to transmit a ring tone to the receiving terminal; When the receiver recognizes the ring tone and selects a specific button on the terminal to request a video preview service, the receiving exchange activates the video preview service; After the video preview service is activated, as the receiver sees the video signal of the caller and decides whether to use the terminal, the receiver exchanges the call with the receiver or the caller to the receiver's voicemail. Caller identification video service method of a mobile communication network, characterized in that. The method of claim 1, wherein activating the video preview service comprises: Caller identification video of mobile communication network, characterized in that the receiver switch or the receiver terminal is equipped with specific software so that the video signal of the sender is transmitted to the receiver terminal and the video signal of the receiver is blocked from being transmitted to the caller side. How to service. The method of claim 1, wherein the specific button pressed by the receiver to request activation of a video preview service to a receiving exchange is Caller identification of a mobile communication network, characterized in that it is specified in advance as a special button on the terminal or a call button used for general call connection, and the receiving exchange determines whether the video preview service is active only when the button is pressed. Video service method. The method of claim 3, wherein activating the image preview function as the receiver presses a special button on the terminal. The receiving exchange transmits a call connection request and a pseudo ringback tone to the calling terminal so as to transmit the caller's video signal to the receiving terminal and recognizes that the calling state of the receiving side is maintained. A video service method for identification of a caller in a mobile communication network. The method of claim 3, wherein activating a video preview service when the receiver selects a general call button on a terminal, This is performed for the receiver subscribed to the video preview service, and when the receiving terminal transmits the call connection request to the receiving exchange, the receiving exchange receiving the call connection request sends a call connection request and a pseudo ringback tone. And transmitting the video signal of the caller to the receiver and recognizing that the calling state of the receiver is maintained for the calling party. The method of claim 4, wherein determining whether to call When the receiver sees the sender's video signal and presses the normal call button, the call exchange request is sent to the receiving exchange, and the receiving exchange stops transmitting the pseudo ringback tone and switches to the call connection state, or the receiver selects a specific key. When the call reject request is sent to the receiving exchange by pressing, the receiving exchange confirms the caller's identity of the mobile communication network by disconnecting the call and stopping transmission of the pseudo ringback tone. Video service method. The method of claim 5, wherein the step of determining whether to call; When the receiver sees the sender's video signal and presses a specific key on the terminal to receive the corresponding DTMF signal at the receiving exchange, the receiving exchange stops the transmission of the pseudo ringback tone and switches to the call connection state. If the corresponding DTMF signal is transmitted to the receiving exchange by pressing a key, the receiving exchange identifies the caller's identity by connecting the caller to the receiver's voicemail by releasing the call and stopping transmission of the pseudo ringback tone. Video service method for confirmation.