KR20070079114A - Method and apparatus for handovering between picture call and voice call of dual mode mobile communication set - Google Patents

Abstract

A handover method between a video call and a voice call in a dual mode mobile terminal and an apparatus thereof are provided to enable a seamless call service by minimizing the time required for handover from a video call service to a voice call service so that the voice call service can be provided through a CDMA modem together with the video call service through a WCDMA modem when handover is performed in a dual mode mobile terminal. Executing a video call service with the second mobile terminal, the first mobile terminal measures radio quality of the video call service. If the measured quality is below a specific reference value, the first mobile terminal transmits a measurement report message to a WCDMA network(310). The WCDMA network confirms the measurement report message, and transmits a handover message to each mobile terminal(320). Each mobile terminal drives its own CDMA modem, sets up a voice channel and a voice vocoder to execute a voice call service through a CDMA network, and transmits a handoff complete message to the CDMA network(330,340). Then, the mobile terminals release the video call service(350). The CDMA network, receiving the handoff complete messages from the mobile terminals, connects a voice call service between the mobile terminals(360). The mobile terminals turn off their WCDMA modems or drive them in low power mode(370).

Description

TECHNICAL AND APPARATUS FOR HANDOVERING BETWEEN PICTURE CALL AND VOICE CALL OF DUAL MODE MOBILE COMMUNICATION SET}

1 is a diagram illustrating a configuration of a handover device between a video call and a voice call of a dual mode mobile communication terminal according to an embodiment of the present invention.

2 is a diagram illustrating a flow of a handover method of a dual mode mobile communication terminal according to an embodiment of the present invention.

3 is a diagram illustrating operations between a dual mode mobile communication terminal, a WCDMA network, and a CDMA network according to the present invention.

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

100: handover device

110: WCDMA Modem

120: CDMA modem

130: wireless quality measurement unit

140: control unit

150: user interface unit

The present invention relates to a handover method between a video call and a voice call of a dual mode mobile communication terminal and a device thereof, and more particularly, to a video call service using a WCDMA method in a dual mode mobile communication terminal supporting both WCDMA and CDMA methods simultaneously. The present invention relates to a method and apparatus for handover from a WCDMA video call service to a CDMA voice call service when the measured wireless quality falls below a specific reference value by measuring the wireless quality while performing the operation.

In general, the dual-mode mobile communication terminal is a terminal that supports the WCDMA and CDMA simultaneously and receives voice call service through the WCDMA network or the CDMA network.

When a conventional dual mode mobile communication terminal reaches a boundary area while receiving a voice service through a WCDMA network, a wireless channel signal received through the WCDMA network is weakened and thus a call is disconnected to perform a handover to the CDMA network.

However, when the conventional dual mode mobile communication terminal approaches the area where the WCDMA network is no longer serviced while performing the video call service through the WCDMA network, the video call service is interrupted due to the loss of the wireless channel through the WCDMA network. do.

In this case, the conventional dual mode mobile communication terminal takes a certain time before the video call is disconnected, and provides the user with a very poor quality video call service in which the video is disconnected in this state.

As described above, when the conventional dual mode mobile communication terminal reaches the WCDMA boundary area when the video call is performed, the video call is gradually terminated because the handover function is not supported. In this case, the conventional dual mode mobile communication terminal has a problem that the user has to try again by redialing a CDMA voice call because the video call is impossible.

Accordingly, a handover scheme for a service change between a video call and a voice call is more urgently required in a dual mode mobile communication terminal.

The present invention has been made to improve the prior art as described above, and a handover method and apparatus for performing a service change from a video call to a voice call when the service quality deteriorates during a video call in a dual-mode mobile communication terminal It aims to provide.

Another object of the present invention is to provide a method and apparatus for transmitting a measurement report to a WCDMA network when the wireless quality measured for a video call over a WCDMA network is less than a predetermined reference value in a dual mode mobile communication terminal.

Another object of the present invention is to provide a method and apparatus for performing a voice service through a CDMA network when a handover message is transmitted from a WCDMA network in a dual mode mobile communication terminal.

It is still another object of the present invention to provide a method and apparatus for turning off a WCDMA modem or operating in a low power mode when a voice call is connected and a video call is disconnected in a dual mode mobile communication terminal.

In order to achieve the above object and to solve the problems of the prior art, the present invention provides a method for performing a video call service over a WCDMA network, measuring a radio quality of the video call service being performed, and measuring the wireless Determining whether the quality is equal to or less than a predetermined reference value; if the measured radio quality is equal to or less than a predetermined reference value, transmitting a predetermined measurement report message to the WCDMA network; Receiving an over message, and performing a voice call service by operating a CDMA modem in response to the received handover message.

A handover device between a video call and a voice call of a dual mode mobile communication terminal according to one aspect of the present invention transmits a predetermined measurement report message to a WCDMA network and receives a handover message from the WCDMA network. A modem, a CDMA modem for performing a voice call service through a CDMA network, a wireless quality measuring unit for measuring wireless quality for a video call service over the WCDMA network, and a wireless quality for the measured video call service are predetermined. And a control unit for controlling the WCDMA modem to transmit the measurement report message to the WCDMA network and controlling the operations of the CDMA modem and the WCDMA modem in response to the received handover message.

Hereinafter, a handover method and a device between a video call and a voice call of a dual mode mobile communication terminal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a handover device between a video call and a voice call of a dual mode mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 1, the handover apparatus 100 includes a WCDMA modem 110, a CDMA modem 120, a wireless quality measurement unit 130, a control unit 140, and a user interface unit 150.

The WCDMA modem 110 performs a video call service over a WCDMA network. That is, the WCDMA modem 120 transmits and receives various data or messages for performing a video call service through the WCDMA network.

In addition, the WCDMA modem 110 transmits a Measurement Report message for the radio quality of the video call over the WCDMA network to the WCDMA network, and receives a Handover message from the WCDMA network.

That is, the WCDMA modem 110 transmits the measurement report message to the WCDMA network when the wireless quality of the video call service measured while performing the video call service falls below a predetermined reference value, and from the WCDMA network. The handover message may be received. In this case, the handover message includes various parameter information necessary for setting CDMA basic voice information.

The CDMA modem 120 performs a voice call service through a CDMA network. That is, the CDMA modem 120 transmits and receives various data or messages for performing a voice call service through the CDMA network.

In addition, when the CDMA modem 120 is switched from the video call service over the WCDMA network to the voice call service over the CDMA network according to the received handover message, the CDMA modem 120 sends a handoff complete message to the CDMA network. To send. That is, the CDMA modem 120 may set a voice channel and a voice vocoder in response to the received handover message, and transmit the handoff complete message to the CDMA network.

The wireless quality measuring unit 130 measures the wireless quality of the video call service while performing the video call service through the WCDMA network. That is, the wireless quality measurement unit 130 may measure the wireless quality of the video call data received through the WCDMA modem 110 while the video call service is performed through the WCDMA network.

The controller 140 controls the WCDMA modem 110 to perform a video call service through the WCDMA network, and controls the CDMA modem 120 to perform a voice call service through the CDMA network.

In addition, the controller 140 controls the wireless quality measurement unit 130 so that the measured wireless quality is measured while the dual mode mobile communication terminal performs the video call service.

In addition, the controller 140 controls the WCDMA modem 110 so that the measurement report message is transmitted to the WCDMA network to inform the WCDMA network when the measured radio call quality is less than or equal to a predetermined reference value.

In addition, when the handover message is received from the WCDMA network through the WCDMA modem 110, the controller 140 notifies the user of the change from the video call service to the voice call service through the user interface 150. The interface unit 150 is controlled.

In addition, when the handover message is received, the controller 140 operates the CDMA modem 120 and then uses the parameter for setting CDMA basic voice information included in the received handover message to operate the CDMA modem 120. Control to transition to the busy state.

In addition, the controller 140 may set a voice channel and a voice vocoder for performing a voice call service by the CDMA network through the CDMA modem 120.

Accordingly, the dual mode mobile communication terminal according to the present invention provides a video call service through the WCDMA modem 110 while the voice channel for the voice call service by the CDMA network is established through the CDMA modem 120. Enter the CDMA traffic state for providing the call service.

In addition, the controller 140 controls the CDMA modem 120 to transmit the handoff complete message to the CDMA network, and controls the WCDMA modem 110 to release the video call service. At this time, when receiving the handoff complete message, the CDMA network connects the voice call to the mobile communication terminal of the other party.

In addition, when the video call service is released, the controller 140 controls the WCDMA modem 110 to turn off the power of the WCDMA modem 110 or to operate in a low power mode.

The user interface 150 performs various interfaces with the user according to the operation of the dual mode mobile communication terminal.

The user interface 150 notifies the user of various states of a video call service performed as a request for a video call service is input from the user.

In addition, the user interface 150 may notify the user that the video call service is changed from the video call service to the voice call when the handover is performed while the wireless quality deteriorates during the video call service.

As described above, the handover device of the dual mode mobile communication terminal according to the present invention performs a voice call through the CDMA network in the video call service through the WCDMA network when the call quality is lower than expected when performing the video call service through the WCDMA network. You can change it to a service.

2 is a diagram illustrating a flow of a handover method of a dual mode mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 2, in step 210, the dual mode mobile communication terminal performs a video call with the other party's mobile communication terminal.

That is, in step 210, the dual mode mobile communication terminal performs a video call service with the other party's mobile communication terminal through a WCDMA network.

In step 220, the dual mode mobile communication terminal measures the radio quality of the video call service while performing the video call service.

That is, in step 220, the dual mode mobile communication terminal may measure radio quality of video call data transmitted through the WCDMA network from the mobile communication terminal of the counterpart performing the video call service.

In step 230, the dual mode mobile communication terminal determines whether the wireless quality for the video call service measured while performing the video call service is less than a predetermined reference value. In this case, the predetermined reference value is reference data for determining whether to change from the video call service to the voice call service as the wireless quality of the Mars call service deteriorates.

If the measured radio quality is not less than the predetermined criterion, the dual mode mobile communication terminal continues to perform a video call service with the other party's mobile communication terminal.

In contrast, if the measured wireless quality is less than the predetermined reference value, in step 240, the dual mode mobile communication terminal transmits a measurement report message for the wireless quality of the video call service to the WCDMA network.

In this case, the WCDMA network receives a measurement report message transmitted from the dual mode mobile communication terminal, and the wireless quality of the video call service of the dual mode mobile communication terminal is deteriorated by the received measurement report message. If it is necessary to change from the call service to the voice call service, a handover message is transmitted to the dual mode mobile communication terminal.

In step 250, the dual mode mobile communication terminal receives the handover message from the WCDMA network. In this case, the handover message includes various parameter information necessary for setting CDMA basic voice information.

In step 250, the dual mode mobile communication terminal may inform the user that the video call service is changed from the video call service to the voice call service when the handover message is received.

In step 260, the dual mode mobile communication terminal sets up a voice channel and a voice vocoder for a voice call by operating a CDMA modem in response to the received handover message. In this case, the WCDMA modem is in a state of performing a video call service with the other party's mobile communication terminal, and the CDMA modem is in a state of CDMA traffic for entering a voice call service.

That is, in step 260, the dual mode mobile communication terminal transitions the CDMA modem to the busy state by using parameter information included in the received handover message.

In step 270, the dual mode mobile communication terminal transmits a handoff complete message to the CDMA network. The CDMA network receives a handoff completion message transmitted from the dual mode mobile communication terminal, and connects the dual mode mobile communication terminal with a voice call service of the mobile communication terminal period of the other party in response to the handoff completion message.

In step 280, the dual mode mobile communication terminal releases the video call service through the WCDMA network.

In step 290, when the voice call service through the CDMA network is connected, the dual mode mobile communication terminal turns off the power of the WCDMA modem or operates the WCDMA modem in a low power mode.

As described above, the handover method of the dual mode mobile communication terminal according to the present invention provides a voice call through the CDMA network in the video call service through the WCDMA network when the call quality is lower than expected when performing the video call service through the WCDMA network. You can change it to a service.

3 is a diagram illustrating operations between a dual mode mobile communication terminal, a WCDMA network, and a CDMA network according to the present invention.

Referring to FIG. 3, in step 310, the first mobile communication terminal measures wireless quality of the video call service while performing a video call service with a second mobile communication terminal, and the measured wireless quality is a predetermined reference value. In the following case, the measurement report message is transmitted to the WCDMA network. The first mobile communication terminal and the second mobile communication terminal are dual mode mobile communication terminals, and perform the video call service with each other through the WCDMA network.

In step 320, the WCDMA network receives the measurement report message, and if the measured radio quality is not enough to perform the video call service with a predetermined reference value or less, CDMA to the video call service over the WCDMA network A handover message for changing to a voice call service through a network is transmitted to the first mobile communication terminal and the second mobile communication terminal, respectively. In this case, the handover message includes various parameter information necessary for setting CDMA basic voice information.

In step 330, the first mobile communication terminal and the second mobile communication terminal receive the handover message transmitted from the WCDMA network, operate a CDMA modem to operate a voice channel for a voice call service through a CDMA network; Set the voice vocoder.

That is, in step 330, the first mobile communication terminal and the second mobile communication terminal may transition the CDMA modem to the busy state by using the CDMA basic voice information setting parameter included in the received handover message. have.

At this time, the WCDMA modem is in a state of performing a video call service with the other party's mobile communication terminal, and the CDMA modem is in a CDMA traffic state for entering a busy state and providing a voice call service with the other party's mobile communication terminal. .

In step 340, the first mobile communication terminal and the second mobile communication terminal transmits a handoff completion message to the CDMA network.

That is, in step 340, when the first mobile terminal and the second mobile communication terminal are ready to change from a video call service to a voice call service, the first mobile communication terminal may transmit the handoff complete message to the CDMA network.

In step 350, the first mobile communication terminal and the second mobile communication terminal release the video call service.

In step 360, when the CDMA network receives the handoff complete message transmitted from the first mobile communication terminal and the second mobile communication terminal, a voice call between the first mobile communication terminal and the second mobile communication terminal period is performed. Connect the service.

In step 370, the first mobile communication terminal and the second mobile communication terminal turn off the power of the WCDMA modem or operate the WCDMA modem in a low power mode as the video call service is released.

As described above, the handover method of the dual mode mobile communication terminal according to the present invention provides a video call service through a CDMA modem while performing a video call service through a WCDMA modem at the time of handover. The time required to change from voice to voice call service is very short, which is effective to enable continuous call service.

In addition, a handover method between a video call and a voice call of a dual mode mobile communication terminal according to the present invention includes a computer readable medium including program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The medium or program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include machine code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

According to the present invention, when performing a video call service over a WCDMA network in a dual mode mobile communication terminal supporting WCDMA and CDMA wireless access technologies, if the call quality falls below expectations, the video call service over the WCDMA network It can be changed to voice call service through CDMA network.

In addition, according to the present invention, since the voice call service is provided through the CDMA modem while the video call service is performed through the WCDMA modem at the time of handover in the dual mode mobile communication terminal, the video call service is changed to the voice call service. The change time is so short that it has the effect of enabling continuous call service.

Claims (11)

A method for handover between a video call and a voice call of a dual mode mobile communication terminal, Performing a video call service over a WCDMA network; Measuring radio quality for the video call service being performed; Determining whether the measured radio quality is below a predetermined reference value; Sending a measurement report message to the WCDMA network if the measured radio quality is less than or equal to a predetermined reference value; Receiving a handover message from the WCDMA network; And Operating a CDMA modem in response to the received handover message to perform a voice call service Handover method comprising a. The method of claim 1, The handover message comprises a parameter information for setting the CDMA basic voice information. The method of claim 2, The step of operating a CDMA modem in response to the received handover message to perform a voice call service, And translating the CDMA modem to a busy state by using a parameter included in the received handover message. The method of claim 1, And notifying the user of the change from the video call service to the voice call service according to the received handover message. The method of claim 1, The step of operating a CDMA modem in response to the received handover message to perform a voice call service, Operating a CDMA modem in response to the received handover message to establish a voice channel and a voice vocoder; And Transmitting a handoff complete message to the CDMA network Handover method comprising a. The method of claim 1, Releasing the video call service when the voice call service is connected through the CDMA network; And Turning off the WCDMA modem or operating in a low power mode; Handover method characterized in that it further comprises. In a handover device between a video call and a voice call of a dual mode mobile communication terminal, A WCDMA modem for transmitting a measurement report message to a WCDMA network and receiving a handover message from the WCDMA network; A CDMA modem for performing voice call service over a CDMA network; A radio quality measuring unit for measuring radio quality of a video call service through the WCDMA network; And If the wireless quality for the measured video call service is less than a predetermined threshold, the WCDMA modem is controlled to transmit the measurement report message to the WCDMA network, and the CDMA modem and the WCDMA in response to the received handover message. Controls that control the operation of the modem Handover device comprising a. The method of claim 7, wherein The control unit, And controlling the CDMA modem by using a parameter included in the received handover message. The method of claim 7, wherein The CDMA modem, And a voice channel and a voice vocoder in response to the received handover message, and transmits a handoff complete message to the CDMA network. The method of claim 7, wherein The control unit, And when the voice call service is connected through the CDMA network, controlling the WCDMA modem so that the WCDMA modem is powered off or operated in a low power mode. The method of claim 7, wherein And a user interface unit notifying the user of the change from the video call service to the voice call service in response to the received handover message.

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