KR20020055764A - Control method for call connection in image communication - Google Patents

Abstract

PURPOSE: A call connection control method in case of a video call connection is provided to allow an originating terminal to be selectively connected to a call service according to a service option of a recipient terminal without attempting re-call connection by making an automatic connection according to video or voice service option support of the recipient terminal even if the originating terminal always attempts a voice call connection. CONSTITUTION: When an originating terminal attempts a video call, an origination message is transmitted to a base station(S201). Upon receiving the origination message, the base station transmits a general page message to a recipient terminal(S202). The recipient terminal performs a service negotiation as to whether to support an image or a video(S203). The recipient terminal transmits a page response message to the base station in response to the general page message after the service negotiation(S204). Upon receiving the response message, when the base station transmits a channel assignment message for a call connection according to the service negotiation result to the originating terminal(S205), a traffic channel is assigned to the originating terminal(S206). The base station transmits a service connection message including a service option field for the service determined through the corresponding traffic channel to the originating terminal(S207). The originating terminal prepares a call according to the corresponding service of the service option field(S208). The originating terminal transmits a service connection completion message to the base station, so that the two terminals perform a call according to the service connection.

Description

Control method for call connection in image communication

The present invention provides a code division multiple access mobile terminal, in particular, in the case of a connection attempt for a video call origination or reception connection, to determine the connection to a voice call service or a video call service in a service option negotiation procedure according to the terminal service purpose. The present invention relates to a method for controlling a call connection during a video call.

The call connection method in the conventional voice call connection is shown in FIG.

1, receiving a call request message from a sending terminal; receiving the request message and transmitting the request message as a universal page message to a receiving terminal; Performing a voice service negotiation at a receiving terminal receiving the universal page message; Responding to a universal page response message after negotiating the voice service; Transmitting, by the base station, a channel assignment message to a transmitting terminal according to the page response message, and transmitting a service connection message when a call channel is allocated; And making a call by transmitting a service connection completion message from the base station by making a call connection according to the service connection message.

Referring to the accompanying drawings, a call connection method in the conventional voice call connection configured as described above is as follows.

When the sender terminal 10 attempts a voice call (S10), a voice call request message having a voice service option (SERVICE_OPTION = voice) field is transmitted to the base station 20 (S11), and the base station 20 receives the voice call. Upon receiving the message, a general page message (S12) including a service option field is transmitted to the receiving terminal 30 (S12).

Here, the stored voice service option number is stored in the service option field (SERVICE_OPTION), and the receiving terminal 30 receiving the message performs a service negotiation with the base station 20 after receiving the message (S13). At this time, it is determined whether the voice service.

The receiving terminal 30 sends a page response message in response to the universal page message after the service negotiation (S14). At this time, the service option field carries the voice service option number.

Then, after receiving the response message, the base station 20 transmits a channel assignment message to the transmitting terminal 10 for the call connection according to the service negotiation result (S15) and is assigned a traffic channel (S16). ).

When the traffic channel is allocated, the base station 30 transmits a service connection message including a service option field to the transmitting terminal 10 for the service determined through the traffic channel (S17). At this time, the transmitting terminal 10 prepares a voice service call as a service in the service option field (S18), and transmits a service connection completion message to the base station 20 (S19).

Thereafter, the base station 20 receives the service connection completion message of the transmitting terminal 10 and supports a voice call with the receiving side (S19).

As described above, when the sender terminal 10 sends a call request message to the base station 20 to send a voice call, the sender terminal 10 carries the voice service option number in the service option field. It sends a service option number for a voice call defined between separate operators in a service option field. According to the service option field, the voice service option is negotiated and the call is made.

However, when attempting a video call in a code division multiple access (CDMA) mobile communication terminal, if the other terminal is a terminal that supports voice service, the terminal fails. There is a problem to retry in call mode. In addition, there is no method for the transmitting user to confirm whether the other party supports only a voice call when the video call is connected.

The present invention has been made to solve the above-described problems, and even if the sending terminal always attempts to access a video call, the terminal can be automatically connected depending on whether the other terminal supports the video or audio service option. It is an object of the present invention to provide a method for controlling a call connection during video call connection, which does not need to attempt to connect a call and can display the voice call mode on the receiving terminal screen.

1 is a signal flow diagram illustrating a call connection control method in the conventional voice call connection.

2 is a signal flow diagram illustrating a call connection control method for video call connection according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ... sending terminal 200 ... base station

300 ... receiving terminal

In order to achieve the above object, the present invention provides a call connection determination method when connecting a video call,

Transmitting a request message to a base station by attempting a video call of a transmitting terminal;

Transmitting the received call attempt message to a receiving terminal;

Negotiating a service according to whether video or audio is supported with the receiving terminal and receiving a response message for receiving a video or video call from the receiving terminal;

A base station receiving the response message transmits a channel assignment message to a transmitting terminal and transmits a service connection message when a call channel is allocated;

And preparing for a call with a corresponding video or audio service by the service connection message, and transmitting and receiving a call.

In this case, it is characterized in that if the receiving terminal is a voice service option together with channel assignment to the transmitting terminal.

The present invention supports a video call or a voice call when the sending terminal attempts a video call regardless of the service option of the receiving terminal, and notifies the receiving terminal when the receiving terminal uses only the voice service option. will be.

Referring to the accompanying drawings, a method for controlling a call connection when connecting a video call according to the present invention configured as described above is as follows.

First, the transmitting terminal 100 is capable of video call service, and when the receiving terminal does not know whether the video call service is available, it enables the video call service to automatically connect to the video call or voice call. .

To this end, when the transmitting terminal 100 attempts a video call (S200), a call request message (Origination message) is transmitted to the base station 200 (S201), the base station 200 receives the request message to receive the other party The universal page message is transmitted to the side terminal 300 (S202).

Here, the stored voice service option number and video service option number are stored in the service option field (Service option = video) and the optional service (ALT_SO = voice) option field included in the message transmitted from the transmitting terminal 100, respectively. By passing through the base station 200 to the receiving terminal, the service negotiation after receiving the message.

Here, the Alternative service option (ALT_SO) field is assigned to the message for use as a secondary service option that can be replaced in addition to the service option field.

At this time, the receiving terminal 300 performs a service negotiation according to whether video or audio is supported (S203), and as a result, the receiving terminal 300 accepts a video service option when supporting a video call. If the call is not supported, the voice service is accepted by the voice service option field (ALT_SO).

Then, the receiving terminal 300 transmits the page response message to the base station 200 in response to the universal page message after the service negotiation (S204). In this case, if the video call function is provided to the corresponding service option field, the video service option number is assigned. If the terminal does not support the video service, the voice service option number is also sent.

Then, when the base station 200 transmits a channel assignment message for call connection to the transmitting terminal 100 according to the service negotiation result after receiving the message (S205), a traffic channel is allocated to the transmitting terminal 100 ( S206). Then, when the channel is allocated, the base station 200 transmits a service connection message including a service option field for a service determined through the corresponding traffic channel to the transmitting terminal 100 (S207).

At this time, the transmitting terminal 100 prepares a call according to the corresponding service in the service option field (S208). In the case of a video service, the calling terminal prepares a video call and prepares a voice call in the case of a voice call. Thereafter, the service connection termination message is transmitted to the base station 200 (S209), and the transmission / reception terminal terminals 100 and 300 perform the call over the service connection.

In this case, when the receiving terminal 300 supports only the voice service, the receiving terminal 300 displays the voice service connection state on the display window.

Therefore, after the terminal 100 selects the video call priority mode and attempts to connect to the video call every time, the counterpart terminal 300 performs the video call or the voice call in the service negotiation procedure even when the video call is not supported. And automatically connects to the voice call or the video call according to the determined service option. At this time, if it is determined that the voice service during the call connection attempt, the phrase indicating the connection status to the voice service is displayed on the display window before the start of the call of the transmitting terminal.

As described above, the present invention provides a method of controlling a call connection when a video call is connected, so that the terminal may be automatically connected depending on whether the other terminal supports the video or audio service option even when the transmitting terminal always attempts to access the video call. By selectively connecting to the corresponding call service according to the service option of the receiving terminal, the user does not have to try to call again, and also displays the voice calling mode on the receiving terminal screen so that the user can make a call without any key operation. It works.

Claims (2)

Receiving, by the base station, a call request message by a video call attempt of a transmitting terminal; Transmitting the received call request message as a universal page message to a receiving terminal; Receiving a response message for a video or video call determined after service negotiation according to whether the video or audio is supported with the receiving terminal; Transmitting a service connection message when a call channel is allocated by transmitting a channel assignment message to the transmitting terminal; And preparing a call with a video or audio service according to the service connection message, and transmitting and receiving a call. The method of claim 1, wherein a call service option of the receiving terminal is displayed on the transmitting terminal requesting the video calling connection before the call with the other terminal is started.