KR100620011B1 - Methods and apparatus' of vsc for mobile phone - Google Patents

Abstract

According to the present invention, when a packet channel for transmitting a video signal is blocked in a V-call of a portable terminal, the captured video signal is recorded and stored in a buffer unit and transmitted normally through a reconnected packet channel. By analyzing the control command applied from the input / output unit and transmitting the video signal to the other party's IP in the packet mode in the state of activating the wireless unit and communicating with the two-way audio signal of the circuit mode, the counterpart is controlled by the VSI unit. It checks whether the V-call function is provided, and transmits the video signal applied from the photographing unit in one-way packet mode. When the GPS signal is blocked by the system, the applied video signal is recorded and stored in the buffer unit and updated by the RS message. Characterized in that the connection and retransmission, and further, by the controller of the mobile terminal If you want to transmit the video signal captured by voice call while V-call is in progress, check whether the V-call function is equipped with the V-call and in the state of voice communication in circuit mode by V-call It transmits one-way video signal in packet mode, records and stores the video signal that is taken and applied in the buffer when the call is blocked, and sets and retransmits the call to the RS message as an RS message. It is done.

Description

V-Scall apparatus and method of mobile terminal {METHODS AND APPARATUS 'OF VSC FOR MOBILE PHONE}

1 is a configuration diagram of a V-call apparatus in a general mobile communication system;

2 is a flowchart of a V-call processing method of a mobile communication system according to the prior art;

3 is a functional diagram of a V-call apparatus of a mobile terminal according to the present invention;

4 is a flowchart of a V-call method of a mobile terminal according to the present invention.

          ** Explanation of symbols on the main parts of the drawing **

100: wireless unit 110: control unit 120: memory unit

130: input and output unit 140: buffer unit 150: V Sushi unit

160: shooting unit

According to the present invention, a mobile terminal transmits a video signal in one-way in a two-way voice communication state by V-call. In particular, when a one-way packet service for transmitting a video signal is blocked due to a change in the surrounding wireless environment, the captured image is taken. The present invention relates to a VSC (Video SHARING CALL) apparatus and method for temporarily storing and storing a signal in a buffer unit, reconnecting a packet mode call, and retransmitting a video signal in the buffer unit.

A mobile terminal for mobile communication (UE: USER EQUIPMENT) freely moves in a service area formed by a corresponding base station (RAN: RADIO ACCESS NETWORK) of a registered system, and moves to a mobile switching center (MSC: MOBILE SWITCHING CENTER or SGSN: SERVING GPRS SUPPORT NODE) It is a high-tech digital wireless communication device that communicates instantly with the desired party anytime, anywhere through the communication path established by monitoring, control and switching (SWITCHING), and the individual always carries and moves directly.

The communication method of the mobile communication system including the mobile terminal (UE) is a method of using only the voice signal of the initial (1G: 1st GENERATION) and the second generation (2G: 2nd GENERATION), and the symbols, letters and numbers Data level message communication method using and graphics and graphics, and the recent third generation (3G: 3rd GENERATION), there is a multimedia level communication method including a video signal in the audio and data levels.

The portable terminal (UE) connected to the third generation (3G) mobile communication system transmits the video signal photographed by the portable terminal in the packet mode of GPRS in a state of bidirectional communication with the other party in a circuit mode. This operation is called VSC (Video SHARING CALL).

When the mobile terminal (UE) is connected in a packet (PS) PACKET SWITCH (MODE) mode, the RUE (ROUTING AREA UPDATE) message is periodically transmitted to the system to confirm the usage of GPRS. If the update cannot be confirmed by the mobile station, the packet mode is blocked by the mobile switching center.

Therefore, the VSC has a problem that the transmission of the unidirectional video signal in the packet mode is interrupted when the GPRS update is not confirmed by the RAU message even when the voice level communication in the circuit mode is in progress. There is.

Accordingly, since the RAU update confirmation cannot be performed as described above, if the packet mode is temporarily blocked, it is necessary to develop a technique for storing the captured video signal and retransmitting the packet mode in the activated state.

Hereinafter, a V escall method of a portable terminal according to the prior art will be described with reference to the accompanying drawings.

Attached to describe the prior art, FIG. 1 is a VCS call function configuration diagram of a general mobile communication system, and FIG. 2 is a flowchart of a VCS call processing method of a conventional mobile communication system.

Referring to FIG. 1, a V-call apparatus of a general mobile communication system, the 3rd generation mobile terminal (UE) 10 wirelessly moves within a service area formed by a base station (RAN) 20 while communicating with a desired counterpart. It connects selectively to voice level communication in the circuit (CS: CIRCUIT SWITCH) mode (MODE) and data level communication in the packet (PS: PACKET SWITCH) mode.

The base station (RAN) 20 forms a service area and performs a base station (NODE-B or BS: BASE STATION) for wireless transmission and reception of various communication signals, and a base station for monitoring, controlling and managing the base station (NODE-B). A circuit switching station (MSC) 30 that includes a controller (RNC: RADIO NETWORK CONTROLLER or BSC: BASE SITE CONTROLLER), switches and sets the voice level communication path, and controls and monitors the operation of the entire mobile communication system. And a packet-switching station (SGSN) 50 which switches and sets a data-class communication path, respectively, and transmits a corresponding signal.

When the portable terminal 10 intends to communicate with the other party connected to another communication network by voice level signal, the circuit switching station 30 connects to and controls the public network 40 to establish a communication path with the corresponding party.

In addition, when the mobile terminal 10 wishes to communicate with the other party in a packet mode by GPRS (GENERAL PACKET RADIO SERVICE), the packet switching station 50 establishes a communication path by a corresponding switching process. When the other party is connected to the Internet-based MULTIMEDIA SUBSYSTEM (IMS) 70 using an IP address, the GATEWAY GAPWAY SUPPORT NODE (GGSN) 60 is controlled and controlled. The MS 70 is connected, and the other party is connected to the IP address to perform packet data communication.

Hereinafter, referring to the attached VSC processing method of the mobile communication system according to the related art, when a voice level communication is performed with the other party using the mobile terminal 10 (S10), the other party And a call (CALL) by the circuit mode (CS MODE) is connected, and communication is performed using a voice level signal (S20).

When the mobile terminal 10 performs a VSC call for transmitting a unidirectional video signal while performing voice level communication with the other party, the mobile terminal 10 checks whether the VSC call is possible (S30). If it is possible that the other party to the VSC call (VSC) in the check, it is determined whether or not to communicate with the other room (V40) (S40).

When the V escall communication with the other party in the determination (S40), request the V call (VSC) communication to the other party, and receives the reply and analyzes to confirm whether the acceptance (S50), V in the unidirectional packet mode to the mobile communication system The escalation call connection request is set to proceed V-call communication (S60).

When the packet mode communication is performed, the mobile communication system repeatedly sends a RAU message to confirm the GPRS usage status. If the RAU update confirmation is not received, the mobile communication system blocks the packet mode. While voice level communication continues, there is a problem in that one-way video signals cannot be transmitted.

According to the present invention, when a packet call is blocked due to an RAU update error of V-call that transmits a video signal photographed in a two-way voice communication state of a portable terminal, the input video signal is temporarily stored and the video signal stored in a packet call reconnection state. An object of the present invention is to provide a V-call apparatus and method for transmitting a mobile terminal.

In order to achieve the above object, the present invention analyzes a control command applied from an input / output unit by a controller of a portable terminal, activates a wireless unit, and communicates with a bidirectional voice level signal in a circuit mode. When the video signal is unidirectionally transmitted to the other party's IP, the VSI unit is controlled to check whether the other party has the V-call function, and the video signal from the photographing unit is transmitted in the unidirectional packet mode. When blocked, it records and stores the applied video signal in the buffer, and updates and connects it to the RS message to retransmit.

In addition, the present invention has been made in order to achieve the above object, the wireless unit for wireless transmission and reception of two-way voice-level communication and one-way data-level communication signal by wireless connection with the base station of the system; A control unit for connecting to the wireless unit, transmitting a video signal in a voice level communication state, and monitoring the state of storing and transmitting the buffer unit until reconnection when the packet call is blocked; A photographing unit which is connected to the controller and photographs and inputs an image signal under control; A V-Sushi unit which connects to said control unit and sets the one-way communication of packet mode by V-call in the communication progress state by circuit mode; And a buffer unit configured to access the control unit and temporarily store and output the image signal applied from the photographing unit in the allocated area.

In addition, the present invention devised to achieve the above object, the V-call function to the other party, if you want to transmit the video signal photographed in the state of the voice communication by the control unit of the mobile terminal by V-call The video signal of the packet mode is unidirectionally transmitted in the state of the circuit mode voice communication by V-call, and when the call is blocked, the video signal to be photographed and applied is recorded and stored in the buffer, It is characterized by consisting of a series of processes to re-establish the connection to the GPS call as the R.Y. message.

In addition, the present invention devised to achieve the above object, when the V-call communication in the circuit mode voice communication by the control unit of the mobile terminal start process for checking whether the V-call function in the other party and; A packet process for determining whether to establish a GPS call as an ALTP session, input and transmit a video signal, and stop if there is a BS call function in the process; Transmitting a video signal to the other party's IP when the video signal is transmitted in the process, and if the transmission is unsuccessful, determining whether the call setting is blocked; When the call is blocked in the process, the recording process and recording the video signal to the buffer section and the request message of the packet packet to request the establishment of the connection of the RSS call; In the process, when the packet mode GPS connection is established, the video signal stored in the buffer unit is transmitted to the other party's IP, and the packet process returns to the packet process.

Hereinafter, a V-call apparatus and a method of a mobile terminal according to the present invention will be described with reference to the accompanying drawings.

3 is a functional diagram of a V-call apparatus of a mobile terminal according to the present invention, and FIG. 4 is a flowchart of a V-call method of a mobile terminal according to the present invention.

Referring to the attached V-call apparatus of the present invention with reference to FIG. 3, the control command applied from the input / output unit 130 by the control unit 110 of the third generation mobile terminal for mobile communication, When activating the wireless unit 100 and transmitting the video signal to the other party's IP in the packet mode in the state of communicating with the two-way audio signal in the circuit mode (CIRCUIT MODE), the VSI unit 150 is controlled. Check whether the other party has the VSC function, transmit the video signal from the photographing unit 160 in the one-way packet mode, and when the GPRS CALL is blocked by the system, The video signal is recorded and stored in the buffer unit 140, and is updated in a RAU message (MESSAGE).

Referring to the above configuration, the wireless unit 100 wirelessly connects to the base station of the mobile communication system and wirelessly transmits and receives the two-way voice level communication in the circuit mode and the one-way data level communication signal in the packet mode,

When connected to the wireless unit 100, the video signal in a two-way voice communication state by VSC (VIDEO SHARING CALL) one-way transmission of the video signal, the packet unit (PACKET MODE) is blocked until the buffer unit 140 is reconnected By monitoring the state of storing and transmitting in the state), the VSSI unit 150 is activated by the VSC setting control command applied from the input / output unit 130, and voice communication is performed in the CIRCUIT MODE. Confirm whether the other party in progress has a VSC function by SIP (SIP: SESSION INITIATION PROTOCOL), and set the GPRS call in the packet mode by the confirmation. Inputs the video signal of the recording unit 160 and transmits one-way to the RTP session (RTP) and updates the packet's GPI signal by the RAU: ROUTING AREA UPDATE (RAU) message (UPDATE). ), If the update fails, the transmission of the input video signal is interrupted, and the blocked video signal is temporarily stored in the allocated area of the buffer unit 140, and when the GPRS call connection by the packet mode is updated. A control unit 110 for transmitting the image signal stored in the buffer unit 140 again through an RTP session;

A memory unit 120 connected to the control unit 110 and recording and outputting to an allocated area including a V-call operation program and data;

An input / output unit 130 connected to the control unit 110 to input and output communication signals in circuit mode and packet mode, and input control commands, data, and dialing signals necessary for operation of the mobile terminal;

A buffer unit 140 connected to the control unit 110 and temporarily storing and outputting an image signal applied from the photographing unit 160 in an allocated area;

The controller 110 is connected to the control unit 110 and establishes one-way communication in packet mode by V-call in the communication progress state by the circuit mode. The circuit mode is activated by the control of the control unit 110. It is bi-directional communication with voice level signal, sets up VSC call and activates packet mode by RTP session. Unidirectional transmission to the other party of IP address, update packet communication status by RAU (ROUTING AREA UPDATE) message (MESSAGE), and if not, block unidirectional transmission of video signal. V sushi part 150 made of a configuration to be,

The photographing unit 160 is connected to the controller 110 and includes a photographing unit 160 for photographing and inputting an image signal under control.

Hereinafter, according to the present invention having the above-described configuration, it will be described in detail with reference to the accompanying drawings V-call device of the mobile terminal.

The mobile terminal, which is registered and communicates with the third generation mobile communication system, may use a communication method selected from a communication using a voice level signal, a communication using data such as a text message, or a communication using a multimedia level signal including a video signal. In particular, there is an IM (INST MESSAGE) communication method, which is low in communication costs, and recently, VSC (Video SHARING CALL) service that transmits video signals in one direction while voice level communication is bi-directional. Is being developed and provided.

Since the video signal has a large amount of data, it is packet data according to the packet mode of GPRS, and is transmitted by the RTP session. The packet mode transmits the data. In order to maintain the occupancy of the transmitting channel, an RAU (ROUTING AREA UPDATE) must receive an update request and confirmation.

However, in the above RAU processing, the voice level communication by the circuit mode is continued due to the change of the shadow area or the surrounding wireless environment, and the occupation of the unidirectional data channel by the packet mode is stopped. In this case, the captured video signal cannot be transmitted, and an opportunity loss issued when the non-transmitted video signal contains important information degrades the reliability of the system.

Accordingly, in the present invention, when the channel occupancy of the packet mode is stopped in the V escall state, the captured video signal is stored and retransmitted while the channel occupancy is confirmed.

When the operating power is supplied, the controller 110 of the portable terminal reads an operation program, various application programs, and data from the memory unit 120, and enters an operation standby state, and monitors an operation state of each functional unit.

When a command signal for controlling voice communication is applied from the input / output unit 130 monitored by the control unit 110, the wireless unit 100 and the input / output unit 130 are activated to control the voice level according to the specified counterpart and the circuit mode. Bidirectional communication using signals.

As described above, when a control command for transmitting a one-way video signal in the packet mode is applied through the input / output unit 130 while the two-way voice communication is in progress in the circuit mode, the wireless unit is applied. It is determined whether the wireless connection with the other party through the SIP protocol, the V-call communication to the other mobile terminal is provided.

In the confirmation and determination, if the counterpart mobile terminal is equipped with a V-call communication function, the V-SSI 150 is activated and controlled so that the system receives an RTP packet mode by GPRS. When the call request is set and the data channel in the packet mode is allocated and occupied, the photographing unit 160 is activated and controlled to photograph and input an image signal.

The controller 110 transmits the video signal input from the photographing unit 160 to the other party's IP address through a channel of the packet mode occupied by the VSSI 150.

The control unit 110 checks whether or not the video signal transmitted to the other party's IP address is normally transmitted by VSC call, and if the transmission is normally performed in the confirmation determination, the control unit 110 applies from the photographing unit 160. The video signal to be transmitted is continuously transmitted to the specified counterpart.

In order to maintain the occupied state of the packet channel, the controller 110 is updated by RAU processing, and in the state where the update by RAU is repeated, the video signal is unidirectional. Perform the transfer normally.

If the RAU is not updated due to a change in the surrounding wireless environment in which the mobile terminal is located, and the call connection in the packet mode is blocked, the control unit 110 performs a V-call. The one-way transmission of the video signal is stopped and the applied video signal is recorded and stored in the allocated area of the buffer unit 140.

The control unit 110 repeats the location registration update by R. A. again, requests the communication call connection (ATTACH) of GPRS, and when the call in the packet mode is connected by the request, the buffer Since the video signal recorded and stored in the unit 140 is applied to the wireless unit 100, the image signal is transmitted to the other party.

Therefore, in the above-described configuration, if a packet mode connected call is blocked due to a change in the surrounding wireless environment while the video signal is transmitted to the designated counterpart via V-call, the video signal is temporarily stored in the buffer unit. When the location registration of the mobile terminal is updated for a reason, the data is retransmitted, and therefore, there is an advantage of transmitting the video signal without losing the video signal generated while the packet call is blocked.

Hereinafter, according to the present invention with reference to the accompanying Figure 4, when describing the V-call method of the portable terminal, the control unit 110 of the third-generation mobile communication terminal is taken in the state where the voice communication is in progress If you want to transmit the video signal by VSC, check whether the other party's mobile terminal is equipped with VSC function, and perform voice communication in CIRCUIT MODE by VSCall. In this state, the video signal of the packet mode is transmitted in one direction, and when the GPRS CALL is blocked, the video signal to be photographed is stored in the buffer, and the RAU message is stored. It consists of a series of procedures for establishing and retransmitting a GPS call.

Referring to the above-described configuration again, if the VSC communication is performed by the controller 110 of the 3G mobile terminal while the circuit mode voice communication is performed, it is determined whether the counterpart has a V-call function. Confirming, activating the circuit mode by the control unit 110 of the portable terminal and communicating with the other party through a voice signal set through a call set to a designated unique number (S100); Determining whether to perform a VSC communication with the counterpart in which the voice level communication is performed in the circuit mode by the control unit 110 of the step S100 (S110); If the VSC communication with the other party in the process (S110), the start process consisting of the process of determining whether the V-call function is provided in the mobile terminal of the other party by the SIP protocol, and

If the counterpart mobile terminal has a V-call function in the starting process, it sets up a GPRS call with an RTP session, inputs and transmits a video signal, and determines whether to stop transmitting the video signal. In step S130, if the counterpart has a V-call function, the UE establishes the GPS RS call in the one-way data communication packet mode by the ALTP session by the SIP protocol (STO protocol); Inputting an image signal photographed by the controller 110 in step S130 (S140); A packet process comprising a step (S150) of determining whether to stop transmission of the video signal inputted to the designated counterpart in the step (S140);

When the video signal is transmitted in the packet process, it is transmitted to the other party's IP, and if the transmission is not successful, it is determined whether the GPRS call setting is blocked. When the video signal is transmitted, the SIP is transmitted. Unidirectional transmission in the packet mode of the ALTP session to the peer IP address by the protocol through a GPS call (S160); Determining whether the ALTP session packet mode transmission of the video signal to the counterpart IP is successful at step S160; If the transmission of the video signal to the other party by the control unit 110 of the step (S170), the transmission process comprising the step (S180) of determining whether the GPRS (GPRS) call of the packet mode is blocked;

When the call is blocked in the transmission process, the video signal is recorded and stored in the buffer unit 140 and the RAU message is requested to establish a GPS call connection setting in the packet mode, and the control unit 110 requests the packet mode. If it is determined that the GPRS call CALL is blocked, recording and storing the input video signal in the allocated area of the buffer (S190); An egg process comprising a step (S200) of transmitting a RAU message to the system by the control unit 110 of the process (S190) and requesting the establishment of a packet call connection in the packet mode;

In the packet processing mode, when the GPS signal of the packet mode is connected, the video signal stored in the buffer unit 140 is transmitted to the other party's IP, and the control unit returns to the packet process S140 and repeats. Determining whether the GPRS call in the packet mode is connected and established by the 110 (S210); In the process (S210), when the packet mode GPS connection is established, the image signal recorded and stored in the allocated area of the buffer unit 140 is controlled by the control unit 110 to the other IP (RTP). ) Is transmitted to the session, and the buffer process consists of a process (S220) to be repeated in the packet process (S140) and repeated.

Hereinafter, the V escall method of the mobile terminal according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

The controller 110 of the portable terminal occupies the channel set to the circuit mode with the designated counterpart via the activated wireless unit 100, and performs communication using a voice level signal (S100), the input / output unit 130 The control command signal applied from the device is analyzed to determine whether V-call communication is performed (S110).

When the voice level communication is maintained in the determination S110 and the VSC communication for unidirectional transmission of the video signal in the packet mode is performed, the control unit 110 communicates with the wireless unit 110. In operation S120, it is determined whether the V-call communication function is provided in the counterpart mobile terminal using the SIP protocol.

When the counterpart mobile terminal is equipped with the V-call function according to the determination of the control unit 110 of the process (S120), the V-Sushi unit 150 is controlled and requested to the system, thereby making an RTP session (SESSION). A GPRS call communicating in the packet mode is assigned and set (S130).

The controller 110 of the process activates and controls the photographing unit 160 to input a photographed video signal (S140), and determines whether a control command for stopping transmission of the video signal is applied (S150).

If there is no control command to stop the transmission of the video signal, the controller 110 of the step (S150) uses the input video signal as packet data by the ALTP session, and the counterpart by the SIP protocol. It transmits to an IP address (S160).

The controller 110 of step S160 determines whether the packet mode video signal has been successfully transmitted to the other party (S170), and if it is successfully transmitted in the determination (S170), returns to the packet process (S140). Since the above process is repeated, video signal transmission by VSC is repeated.

When the transmission of the video signal is unsuccessful, the controller 110 determines whether the connection of the GPRS communication call in the packet mode has been blocked (SET 180).

If the connection of the GPS communication call is not blocked in the determination (S180), the packet is returned to the packet process (S140), and the process is repeated, so that the video signal transmission by VSC is repeated and the determination is performed. If the connection of the GPS communication call is blocked at step S180, the image signal applied from the photographing unit 160 is recorded and stored in the allocated area of the buffer unit 140 at step S190.

The controller 110 of step S190 transmits an RAU message to the system to update the blocked packet mode call connection, so that the call connection ATTACH by GPRS is performed. Request (S200).

If the packet mode communication call is connected according to the packet packet call connection request in step S200 (S210), and if the call (CALL) is not connected, the procedure proceeds to the end and the call (CALL) is connected. In this case, the video signal recorded and stored in the buffer unit 140 is transmitted to the other party through the wireless unit 100 (S220), and is returned to the packet process (S140), so that the photographing unit 160 photographs in the following order. The transmission of the input video signal is continued.

That is, when the packet mode communication call (CALL) is blocked and the photographed video signal includes important information, the video signal is recorded and stored in the buffer unit 140, and the communication call is made by RAU. If retransmitted in the reconnected state, and does not include important information, the video signal applied from the photographing unit 160 is transmitted in the reconnected state.

Therefore, in the case of VSC communication with the mobile terminal, when the data channel of the packet mode is temporarily blocked due to the change of the surrounding wireless environment, the video signal is recorded and stored in the buffer unit and the data channel is reconnected. Since the transmission selectively in the state, there is an advantage that does not lose important information.

According to the present invention having the above configuration, when the packet mode channel connection is temporarily interrupted in the V-call communication state of the portable terminal, the image signal photographed and applied is recorded and stored in the buffer unit, and the channel is connected again. By retransmitting, there is an industrial advantage of not losing important information.

In the V-call communication, even if the packet mode channel is temporarily blocked due to a change in the surrounding wireless environment, important information is recorded without being lost and retransmitted, so that there is a convenient effect of improving reliability.

Claims (12)

When the control unit of the portable terminal analyzes the control command applied from the input / output unit and transmits the video signal to the other party's IP in the packet mode in the state of activating the wireless unit and communicating with the circuit mode bidirectional voice level signal, Control the unit to check whether the counterpart has V-call function, and transmit the video signal applied from the photographing unit in unidirectional packet mode, and record and store the applied video signal in the buffer unit when the GPS signal is blocked by the system. A V-call apparatus of a portable terminal, characterized by comprising: updating and retransmitting an A-U message. A wireless unit for wirelessly transmitting and receiving two-way voice level communication and one-way data level communication signal by wirelessly connecting to the base station of the system; A control unit for connecting to the wireless unit, transmitting a video signal in a voice level communication state, and monitoring the state of storing and transmitting the buffer unit until reconnecting when a packet call is blocked; A photographing unit which is connected to the control unit and photographs and inputs a video signal under control; A V-Sushi unit which connects to said control unit and sets the one-way communication of packet mode by V-call in the communication progress state by circuit mode, And a buffer unit connected to the control unit and configured to temporarily store and output the image signal applied from the photographing unit in the allocated area. The method of claim 2, An input / output unit which connects to the control unit and inputs / receives a communication signal transmitted / received, and inputs a control command and data and a dialing signal necessary for operating a mobile terminal; And a memory unit for connecting to the control unit, and storing and outputting the recording and output in the allocated area including the V-call operation program and data. The method of claim 2, wherein the V Sushi portion, Under the control of the control unit, the circuit mode is activated, bidirectional communication is performed with a voice level signal, a V-call call is set up, the packet mode is activated by an ALTP session, and the video signal is unidirectionally transmitted to the other party of the IP address. And updating the packet communication status according to the RS message, and if the update fails, interrupting the unidirectional transmission of the video signal. The method of claim 2, wherein the control unit, Activate VBS by VCS call control command applied from the input / output unit, and check with SIP whether the counterpart in voice communication in circuit mode is equipped with VCS function. Set up a call to the GPS signal, and input the video signal of the photographing unit to transmit unidirectionally to the ALTP session, update the packet of the packet mode according to the RF message, and input the video signal if the update fails. Block transmission, temporarily store the blocked video signal in an allocated area of the buffer unit, and retransmit the video signal stored in the buffer unit by an AltiP session when the packet connection by the packet mode is updated. V escall device of a mobile terminal, characterized in that consisting of. If you want to transmit the video signal captured by voice control by the controller of the mobile terminal by V-call, check whether the V-call function is equipped with the V-call and the voice of the circuit mode by V-call It transmits unidirectional video signal in packet mode while communication is in progress, and records and stores video signal in buffer when GPS signal is cut off, and connects and retransmits GPC signal as an RS message. V escall method of a mobile terminal, characterized in that consisting of a process. Starting process of checking whether the other party has a V-call function when the V-call communication is performed while the circuit mode voice communication is performed by the controller of the portable terminal; In the above process, if there is a V-call function, a packet process of determining whether to set up a GPS call as an ALTP session, input and transmit a video signal, and stop the call; In the process of transmitting the video signal to the other party's IP and if the transmission is not successful, the transmission process of determining whether or not the GPS call setting is blocked; When the call is blocked in the above process, the video signal is recorded and stored in the buffer unit and the RS message for requesting the establishment of the packet connection to the packet packet to the RF message; If the packet mode GPI is connected in the process, the V-call method of the mobile terminal, characterized in that the buffer process for transmitting the video signal stored in the buffer unit to the other IP and the feedback to the packet process. The method of claim 7, wherein the starting process, Activating the circuit mode by the controller of the portable terminal and communicating with the other party via a call set to a designated unique number; Determining whether to perform a V-call communication with the counterpart of the voice level communication in the circuit mode by the controller of the process; When the V-call communication with the counterpart in the process, the V-call method of the mobile terminal, characterized in that the process of determining whether or not the V-call function is provided in the mobile terminal by the SIP protocol. The method of claim 7, wherein the packet process, Judging at the start process, if the counterpart has a V-call function, setting up a GPS signal of a unidirectional data communication packet mode by an ALTP session by the SIP protocol; Inputting a video signal photographed by the controller of the process; And determining whether to stop the transmission of the video signal inputted to the designated counterpart in the process. The method of claim 7, wherein the transmitting process, In the case of transmitting the video signal in the packet process, the one-way transmission in the packet mode of the ALTP session through the GPS call to the other IP address by the SIP protocol; Determining whether the ALTP session packet mode transmission of the video signal to the other IP is successful; If the transmission of the video signal to the other party by the control unit of the process, the V-call method of the mobile terminal, characterized in that the process of the step of determining whether the packet is blocked. The method of claim 7, wherein the AL reason process, If it is determined by the control unit of the transmission process that the GPS signal of the packet mode is blocked, recording and storing the input video signal in the allocated area of the buffer; And transmitting the RS message to the system by the control unit of the process and requesting the establishment of the packet call connection of the packet mode. The method of claim 7, wherein the buffer process, Determining, by the controller of the RS process, whether or not a GPS call in a packet mode is connected and established; In the above process, if the packet mode GPI connection is established, the video signal recorded and stored in the allocated area of the buffer unit is transmitted by the other peer IP Altipi session under the control of the controller, and the feedback is repeated in the packet process. V escall method of a mobile terminal, characterized in that made.

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