JP3721118B2 - Mobile communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile communication system that provides a packet communication service and a circuit-switched communication service. The mobile portable terminal (cell phone) having a packet communication function with improved user convenience, and the terminals The present invention relates to a mobile communication system including a circuit switching network and a packet transfer network to be connected, and a communication method.
[0002]
[Prior art]
Conventionally, in a mobile portable terminal provided with a mail function in addition to a call function, each function can be used after passing through a different transition state from the main menu. For this reason, when a call partner (recipient) cannot make a call at the time of a voice call, for example, when the other party uses the answering service of the circuit switching network supported by the other party, this can be used.
[0003]
However, when the other party does not use the answering service, the same purpose can be achieved by sending a message by mail to the same party using a packet transfer network which is a different line. In this case, however, the line must be disconnected and the mobile portable terminal must be operated from the main menu to send a message, and the user has to operate the terminal in a complicated and troublesome procedure. There were difficulties.
[0004]
In addition, when it becomes necessary to send an e-mail to the same party or transfer a received mail during a call, the user temporarily stops the call and re-enters the same party for the data transmission. In order to reconnect, a complicated and time-consuming operation is required. If a call is made again, line disconnection and re-calling are required, and the terminal has to be operated in a complicated procedure.
[0005]
[Problems to be solved by the invention]
The present invention has been made to cope with the above-described problems. When an e-mail or the like is sent to the same party during a missed call or during a call, a circuit switching network during the call with an easy operation / procedure with less burden. It is an object of the present invention to provide a user of a mobile portable terminal with a function that can easily switch between a packet transfer network and a packet transfer network. As a result, the user can easily send a message at the time of a missed call, and can easily transfer information such as text information and image information even during a call, and can realize easy-to-understand information exchange for the other party to communicate, Usability is improved.
[0006]
[Means for Solving the Problems]
  In order to solve the problem, the present invention described in claim 1In a mobile communication system that provides a packet communication service and a circuit-switched communication service, a user calls a call from a sender mobile mobile terminal to another receiver mobile mobile terminal and receives a response from the receiver mobile mobile terminal If there is no, the sender mobile mobile terminal is immediately controlled to transition to the message transmission input state by the packet transfer network to the receiver mobile mobile terminal according to a predetermined operation,
Provided is a mobile communication system characterized in that an input message is transmitted to the recipient-side mobile mobile terminal via a packet transfer network by a user transmission instruction operation..
[0007]
  In the present invention described in claim 2,In a mobile communication system that provides a packet communication service and a circuit-switched communication service, during a call between the first and second mobile mobile terminals, the first mobile mobile terminal immediately responds to a call destination in response to a predetermined operation. There is provided a mobile communication system controlled to transit to an input state for message transmission by a packet transfer network to the second mobile portable terminal.
[0008]
  In the present invention described in claim 3,Provided is a mobile communication system that is controlled to automatically disconnect a line of the circuit-switched communication service when transitioning to the message transmission input state..
[0009]
  The mobile communication of the present invention according to claim 4systemIsAfter the message inputted by the first mobile portable terminal is transmitted to the second mobile portable terminal via the packet transfer network by a user's transmission instruction operation, the first mobile portable terminal The second mobile mobile terminal is automatically controlled to re-call a call request through the switching network..
[0010]
    The mobile communication of the present invention according to claim 5systemIsThe control for automatically transitioning to the message input / transmission screen is executed according to a prior setting.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment] The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a mobile portable terminal according to an embodiment of the present invention. FIG. 2 is a block diagram showing a mobile communication system as an embodiment of the present invention.
[0013]
The mobile mobile terminal of the present invention is a mobile phone (capable of calling) such as a PDC (digital mobile phone) having a packet communication function, and makes a call from the mobile mobile terminal A of the caller to the mobile mobile terminal B of the receiver. When the intended call is made, a normal connection cannot be established between the receiver and the circuit switched network, that is, the receiver is already connected to the circuit switched network in a call state, or the receiver (mobile When the mobile terminal B) is out of service area, the caller can promptly switch to the data communication line such as e-mail using the packet transfer network, and promptly if necessary after the call starts. A mobile portable terminal having a control function that can be freely switched to the line for data communication such as e-mail using a packet transfer network and returned to the original circuit switching network. .
As shown in FIG. 1, the mobile portable terminal of this embodiment includes an antenna U110 that transmits and receives data to and from the network, a radio and modulation / demodulation unit U120 that modulates and demodulates data and converts the data into a radio signal, and a voice call in the control unit U130. Control unit U131, channel switching control unit U132, message editing control unit U133, transmission control unit U134, data memory unit U140 for storing address book and message data, speaker U150 for speech conversation, microphone U160, and user actually An operation unit U170 to be operated and a display unit U180 for displaying data input from the operation unit U170 and received data are configured.
[0014]
The mobile communication system of this embodiment shown in FIG. 2 includes a plurality of mobile mobile terminals as described above (only two mobile mobile terminals A: U01 and mobile mobile terminal B: U06 are shown in the figure), A plurality of base stations (in the figure, base station A: U02 and base station B: U05 are only provided with a switching function unit for switching between a circuit switching network and a packet transfer network in response to a request from a mobile portable terminal. And a mobile communication network configured to include. Each base station is connected by a circuit switching network U03 for voice communication and a packet transfer network U04 for data communication. The packet transfer network U04 is connected to the Internet U08 via the server U07. In the following, the user of mobile digit terminal A is user 1 and the user of mobile digit terminal B is user 2.
[0015]
The usage pattern and operation of the first embodiment will be described. For example, when the user 1 who is a caller makes a call to the receiver (user 2) using the above-described mobile portable terminal device, the user 2 who is the callee from the operation unit U170 which is a normal voice call procedure. The telephone number input of the mobile portable terminal device or the telephone number data in the data memory unit U140 is selected, and the selected telephone number data is converted into a dial tone signal by the transmission control unit U134 in the control unit U130. Via the communication processing and terminal monitoring control unit U135, the dial tone signal is D / A converted by the radio and modulation / demodulation unit U120, and then notified to the circuit switching network U03 via the antenna U110 (calling information transmission). The circuit switching network U03 The mobile portable terminal B: U06 of the user 2 who is a dialing partner is called.
[0016]
After the circuit switching network U03 establishes the communication channel connection, the circuit switching network U03 also establishes a communication channel with the mobile user terminal B of the user who is the recipient, and makes a call to the mobile user terminal B. When an incoming call is received, the ringing tone of the mobile portable terminal B: U06 sounds.
[0017]
The called user 2 is hooked off by the key of the operation unit U170 of the mobile portable terminal B: U06, and the voice call is connected by the circuit switching network U03. The mobile portable terminal is connected between the user 1 and the user 2. The conversation is done using.
[0018]
The mobile terminal according to the present embodiment is configured to be able to freely switch between a circuit switching network used for a call and a packet transfer network used for data communication. Therefore, when data communication such as document e-mail becomes necessary during a call, one of the callers switches from the call to e-mail communication, so a specific key on the operation unit U170 of his / her mobile portable terminal is set. Manipulate. In response to this operation, the voice call control unit U131 disconnects the call (connection) of the circuit-switched network U03 connected by the voice call, and the channel switching control unit U132 performs a control process on the message editing control unit U133. Switch to automatically edit mail content.
[0019]
Here, new mail contents are newly created under the control of the message editing control unit U133, or a desired one of the existing message mails stored in the data memory unit U140 in advance is selected. Subsequently, the message editing control unit U133 selects and sets whether to set a new mail address or from the telephone directory list stored in the data memory unit U140. The outgoing call control unit U134 automatically makes an outgoing call to the packet transfer network U04 with respect to the selected and set mail address, and connects to the packet transfer network U04.
[0020]
The mobile mobile terminal A: U01 on the user 1 side, which has established a connection with the packet transfer network U04, is the message data set in the mobile mobile terminal A: U01 earlier to the mobile mobile terminal B: U06 owned by the user 2 Is transmitted to the mobile portable terminal B: U06, the document mail is provided to the user 2 side, and after all necessary data has been transferred, the packet transfer network U04 is disconnected (packet communication channel disconnection). If necessary settings are made by a predetermined operation, the voice call between the user 1 and the user 2 via the circuit switching network U03 can be resumed after the packet communication channel is disconnected.
[0021]
Further, as described above, the mobile terminal according to the present embodiment is configured to be able to freely switch between a circuit switching network used as a call and a packet transfer network used for data communication. If the circuit switching network is not connected due to the other party's situation when making a call as soon as possible, it is possible to immediately switch directly from the circuit switching network to the packet transfer network and communicate the requirements by e-mail etc. it can.
[0022]
For example, as described above, when the user 1 operates the mobile portable terminal A, transmits the call information, and calls the mobile portable terminal B: U06 of the user 2 who is the dialing partner in the circuit switching network U03. In addition, when the user 2 is already in a call state and the circuit switching network is connected, or when the user 2's mobile portable terminal B is out of the service area and the normal connection cannot be established in the circuit switching network, the same as described above. Switch to the packet transfer network promptly and send the message as an e-mail.
[0023]
Subsequently, the operation of this embodiment will be described with reference to FIGS. 1, 2, and 3. FIG. 3 is a flowchart for explaining the flow of the operation by the user and the operation of each device in the present embodiment.
[0024]
First, the user 1 starts up a mobile portable terminal and performs a connection procedure (S301). The user 1 selects whether to make a call or send an email (S302). When mail transmission (by packet communication) is performed, mail text is input by a predetermined operation procedure from the operation unit U170 (S303). That is, a message text is input / edited by the message editing control unit U133, and an address setting is performed by selecting a new mail address or selecting phone book data stored in the data memory unit U140 as a destination. The packet communication channel is established with the packet transfer network U04 via the mobile portable terminal A: U01 and the base station A: U02 again by the setting procedure from the operation unit U170 (S304).
[0025]
If the connection destination is a personal computer, connection to the Internet: U08 using the TCP / IP protocol is performed via the server: U07, and a mail is transmitted by connecting to the personal computer of the PC user U09 via IP (provider) ( S305). If the connection partner is the mobile portable terminal B, mail transmission is performed to the mobile portable terminal B: U06 via the base station B: U05 (S305), and when the transmission is completed, the packet communication channel is disconnected (S306). This series of processes is a general mail communication flow.
[0026]
On the other hand, when selecting a call (voice channel) in the above-described call or mail transmission selection (process; S302), the user inputs a destination (call destination) telephone number by operating the operation unit U170. Then, telephone number calling processing is performed under the control of the transmission control unit U134 (S307). The mobile portable terminal A establishes a line with the circuit switching network U03 via the base station A, and a call is made from the base station B to the mobile portable terminal B: U06 to prompt the user 2 to respond (S308).
[0027]
If the user 2 responds (S309: YES) and the line is connected, the call is started (S311). However, if the user 2 is not responding due to absence or the like, or if the call cannot be made outside the service area (including power OFF) (S309: NO), the user 1 connects the line between the circuit switching network U03 and the mobile portable terminal A: U01. Cutting is performed promptly (S310). In the mobile portable terminal A, the channel switching control unit U132 directly switches control from the voice call control unit U131 to the message editing control unit U133 according to the prior setting, and the user 1 shifts to mail text input (S303).
[0028]
Thereafter, as described above, the message editing control unit U133 edits the message text and newly sets the mail address or selects the phone book data stored in the data memory unit U140, and again moves according to the setting procedure from the operation unit U170. A packet communication channel is established between the portable terminal A and the packet transfer network U04 via the base station A (S304), and mail is transmitted to the mobile terminal B: U06 as a connection partner via the base station B: U05. (S305) After the transmission is completed, the user 1 disconnects the packet communication channel (S306).
[0029]
Next, description will be made with reference to a flow sequence diagram showing the flow of signals between the devices in FIG. FIG. 4 shows the flow of processing when the communication switching with the packet communication is performed after the mobile phone A and the mobile phone B have already started a call. First, in order to call user 2 from the mobile portable terminal A, the user 1 makes a telephone number call F401, the circuit switching network makes a call request F451 to the mobile portable terminal B, and the mobile portable terminal B makes a call response by F452, In the circuit switching network, after the communication line connection F402 with the mobile portable terminal A is performed, the telephone calls F403 and 453 are performed between the mobile portable terminal A and the mobile portable terminal B through the circuit switching network.
[0030]
For example, when the user 1 sends an e-mail to the user 2 side during a call, the mobile portable terminal A performs a hook-off process once, notifies the line switching network F404, and the circuit switching network is a mobile portable terminal. B is notified that the communication line disconnection F454 has occurred.
[0031]
Thereafter, the mobile portable terminal A shifts to an electronic mail function, and when the user 1 completes preparation for outgoing mail and makes a call operation to start transmission, the mobile portable terminal A sends a packet communication registration request to the packet transfer network at F406. The packet transfer network activates a packet communication channel with the mobile portable terminal A, sends a packet communication registration response to the mobile portable terminal A in F407, and pages the mobile portable terminal B in F455. The paged mobile portable terminal A transmits a packet communication registration request to the network in F456, and the packet transfer network that has established a packet communication channel with the mobile portable terminal B transmits a packet communication registration response in F457.
[0032]
After the packet communication channel is established, the mobile portable terminal A transmits an e-mail to the network at F408. The packet communication channel temporarily stores the data and transmits an e-mail to the mobile portable terminal B at F458. After the transmission of the e-mail to the mobile portable terminal B is completed, the packet transfer network issues a packet communication disconnection request to the mobile portable terminal A by F409, and receives a packet communication disconnection confirmation F410 from the mobile portable terminal A. . After confirming the packet communication registration cancellation request F459, the mobile communication terminal B transmits a packet communication registration cancellation response F460.
[0033]
The effect of the first embodiment described above is that a message to be transmitted can be transmitted to the receiver without any troublesome operation regardless of the situation of the called party (at the time of a missed call or out of service area).
[0034]
The reason for this is that the mobile portable terminal automatically switches to the e-mail mode based on the simple operation by the user based on the situation of the recipient who should receive the call by the call (confirmation by busy tone or guidance), and the packet transfer network This is because it is possible to easily transmit the mail to the receiving user by utilizing the above.
[0035]
The second effect is that important information can be provided as text information to the other party during the call even during the call. The reason is that the circuit switching network in the middle of a call is easily switched to a packet transfer network, and the state of the mobile portable terminal is also switched to e-mail so that it automatically connects to the circuit switching network even after mail transmission is completed. This is because it is configured.
[0036]
In this embodiment, an example in which communication is switched to packet communication after a call has already been started between mobile portable terminal A and mobile portable terminal B and the call is continued again will be described with reference to FIGS. . FIG. 5 is a flowchart for explaining the flow of operations by the user and the operation of each device. FIG. 6 is a flow sequence diagram showing the flow of signals between the devices.
[0037]
First, the user 1 starts up a mobile portable terminal and performs a connection procedure (S501). The user 1 selects whether to make a call or send an email (S502). When mail transmission (by packet communication) is performed, mail text is input by a predetermined operation procedure from the operation unit U170 (S503). That is, a message text is input / edited by the message editing control unit U133, and an address setting is performed by selecting a new mail address or selecting phone book data stored in the data memory unit U140 as a destination. Further, a packet communication channel is established between the mobile portable terminal A: U01 and the base station A: U02 through the setting procedure from the operation unit U170 and the packet transfer network U04 (S304).
[0038]
If the connection destination is a personal computer, connection to the Internet: U08 using the TCP / IP protocol is performed via the server: U07, and a mail is transmitted by connecting to the personal computer of the PC user U09 via IP (provider) ( S505). If the connection partner is the mobile portable terminal B, mail transmission is performed to the mobile portable terminal B: U06 via the base station B: U05 (S505), and when the transmission is completed, the packet communication channel is disconnected (S506). This series of processes is a general mail communication flow.
[0039]
On the other hand, when selecting a call (voice channel) in the above-mentioned call or mail transmission selection (step; S502), the user inputs the destination (call destination) telephone number by operating the operation unit U170. Then, telephone number calling processing is performed under the control of the transmission control unit U134 (S507). The mobile portable terminal A establishes a line with the circuit switching network U03 via the base station A, and a call is made from the base station B to the mobile portable terminal B: U06 to prompt the user 2 to respond (S508).
[0040]
If the user 2 is not present or is out of service area (including power-off) and the call cannot be made (S509), the line switching control unit U132 immediately performs the line disconnection S510 between the circuit switching network U03 and the mobile portable terminal A: U01. Switch from the voice call control unit U131 to the message edit control unit U133, and input a mail text (S503), edit the message text and set a new mail address in the message edit control unit U133, or store in the data memory unit U140 The data selection is performed, and the packet communication channel is established between the mobile portable terminal A and the packet transfer network U04 via the mobile station A and the base station A again by the setting procedure from the operation unit U170 (S504). If there is, mail is transmitted to the mobile portable terminal B: U06 via the base station B: U05 (S5). 5) performs packet communication channel disconnection after the transmission is complete (S506). The process up to this point is the same as in the previous embodiment.
[0041]
When the user 2 side selects line connection (S509: YES) and performs a call start operation (S511), a call (conversation, S512) is performed between the lines by connecting the line switching network U03. When a user (for example, user 1) needs to send an e-mail during a call (e-mail or end of call selection; S513), a predetermined operation is promptly performed from the operation unit U170. By this operation, the mobile portable terminal A: U01 performs line disconnection S514, and the channel switching control unit U132 switches directly from the voice call control unit U131 to the message editing control unit U133. User 1 inputs a mail sentence. The message editing control unit U133 edits the message text, sets a new mail address, or selects the phone book data stored in the data memory unit U140, and again performs a predetermined mail transmission operation from the operation unit U170 (S515).
[0042]
A packet communication channel is established between the mobile portable terminal A and the packet transfer network U04 via the base station A (S516), and if the connection partner is the mobile portable terminal B, the mobile portable terminal B via the base station B: U05: The mail is transmitted to U06 (S517), and after the transmission is completed, the packet communication channel is disconnected (S518). After disconnecting the packet communication channel, the telephone number is immediately returned (step S507) to reconnect the call, and the call is resumed. After the conversation is finished (mail or call termination selection; S513), when the call termination operation is performed, the call is terminated (S510), and the mobile portable terminal shifts to a standby operation.
[0043]
Subsequently, the flow sequence diagram of FIG. 6 will be described. FIG. 6 shows the flow of processing when communication switching with packet communication is performed after a mobile phone A and a mobile phone B have already started a call. First, in order to call user 2 from mobile portable terminal A, user 1 makes a telephone number call F601, the circuit switching network issues a call request to mobile portable terminal B in F651, and mobile portable terminal B sends a call response by F652. Then, after the communication line connection F602 with the mobile portable terminal A is performed in the circuit switching network, calls F605 and 653 are performed between the mobile portable terminal A and the mobile portable terminal B via the circuit switching network.
[0044]
When the user 1 sends an e-mail to the user 2 side during a call, the mobile portable terminal A performs a hook-off process on one end, notifies the line switching network of the call line disconnection F604, and the circuit switching network sends the mobile portable terminal B to the mobile switching terminal B. It notifies the fact that the telephone line disconnection F654 has occurred.
[0045]
Thereafter, the mobile portable terminal A shifts to an electronic mail function, and when the user 1 completes preparation for outgoing mail and makes a call operation to start transmission, the mobile portable terminal A sends a packet communication registration request to the packet transfer network in F605. The packet transfer network activates a packet communication channel with the mobile portable terminal A, sends a packet communication registration response to the mobile portable terminal 1 in F607, and pages the mobile portable terminal 2 in F655. The paged mobile portable terminal B transmits a packet communication registration request to the network in F656, and the packet transfer network that has established a packet communication channel with the mobile portable terminal 2 transmits a packet communication registration response in F657.
[0046]
After the packet communication channel is established, the mobile portable terminal 1 transmits an e-mail to the network at F608. The packet communication channel temporarily stores the data and transmits an e-mail to the mobile portable terminal B at F658. After the transmission of the e-mail to the mobile portable terminal B is completed, the packet transfer network issues a packet communication disconnection request by F609 to the mobile portable terminal 1 and receives a packet communication disconnection confirmation F610 from the mobile portable terminal A. . After confirming the packet communication registration cancellation request F659, the mobile communication terminal B transmits a packet communication registration cancellation response F660.
[0047]
Then, the telephone number call F611 is performed again, the circuit switching network issues a call request to the mobile portable terminal B in F661, the mobile portable terminal B issues a call response by F662, and the circuit switched network communicates with the mobile portable terminal A. After the call line connection F612 is made, calls F615 and 663 are made between the mobile portable terminal A and the mobile portable terminal B via the line switching network.
[0048]
At the end of the call, the mobile portable terminal A performs a hook-off process and notifies the line switching network of the call line disconnection F614, and the line switching network notifies the mobile portable terminal B that the call line disconnection F664 has occurred. .
[0049]
[Second Embodiment] Next, a mobile communication system different from that described above will be exemplified. FIG. 7 is a block diagram showing a mobile communication system as another embodiment of the present invention. The system in FIG. 7 has basically the same system configuration as that in FIG. 2 except that switching units U10 and U11 are provided on the base station A side and the base station B side, respectively. The same reference numerals as those in FIG. 2 denote the same parts. About parts other than U10 and U11, a structure and an effect | action are the same as that mentioned above, and the description which becomes repeated is abbreviate | omitted.
[0050]
Also in the second embodiment, a message to be transmitted can be transmitted to the receiver without any troublesome operation in the same manner as in the previous embodiment, regardless of the situation of the called party (at the time of a missed call or out of service area). In addition, it is possible to provide an effect that important information can be provided as text information to the other party during the call even during the call.
[0051]
In this system, the call switching network U03 and the packet transfer network U04 are always connected to the network, and one of the users who are making a call operates the mobile terminal in the same manner as a call waiting, and the system side responds accordingly. By switching the network, it is possible to easily switch between mail and telephone call frequently without time lag.
[0052]
【The invention's effect】
The first effect of the present invention is that a message to be transmitted can be transmitted to the receiver without any troublesome operation regardless of the situation of the called party (absent call or out of service area). The reason is that it automatically switches to e-mail mode with a simple operation based on the status of the recipient who should receive a call (check by busy tone or guidance), and easily receives mail using the packet transfer network. This is because it can be communicated to the user.
[0053]
The second effect is that important information can be provided as text information during a call. The reason is that the circuit switching network in the middle of a call is easily switched to a packet transfer network, and the state of the mobile portable terminal is also switched to e-mail so that the circuit switching network is automatically connected even after mail transmission is completed. It is.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a mobile portable terminal as an embodiment of the present invention.
FIG. 2 is a system block diagram showing an outline of an embodiment of a mobile communication system of the present invention.
FIG. 3 is a flowchart illustrating a flow of an operation by a user and an operation of each device in the embodiment.
FIG. 4 is a flow sequence diagram showing a signal flow between devices in the embodiment.
FIG. 5 is a flowchart illustrating a flow of an operation by a user and an operation of each device in the embodiment.
FIG. 6 is a flow sequence diagram showing a signal flow between devices in the embodiment;
FIG. 7 is a system block diagram showing an outline of another embodiment of the mobile communication system of the present invention.
[Explanation of symbols]
U01: Mobile portable terminal A
U02 ... Base station A
U03 ... circuit switching network
U04 ... Packet transfer network
U05 ... Base station B
U06 ... Mobile portable terminal B
U07 ... Server
U08 ... Internet
U110 ... antenna
U120: Radio and modulation / demodulation unit
U130 ... control unit
U131 ... Voice call control unit
U132 ... Channel switching control unit
U133 ... Message editing control unit
U134 ... transmission control unit
U140 Data memory unit
U150 ... Speaker
U160 ... Microphone
U170 ... operation unit
U180 ... display section

Claims (5)

In a mobile communication system that provides a packet communication service and a circuit-switched communication service,
When the user calls the other receiver-side mobile mobile terminal from the caller-side mobile mobile terminal and there is no reception response from the receiver-side mobile mobile terminal ,
Depending on Jo Tokoro operation, before Symbol calling party mobile portable terminal is automatically controlled so as to transition to the message input transmission screen for message transmission by the packet transfer network to the recipient's mobile phone,
The transmission instruction operation of the user, the input messages that are sent to the receiver-side mobile portable terminal through the packet transfer network,
Mobile communication system comprising a call. In a mobile communication system that provides a packet communication service and a circuit-switched communication service,
During a call between the first and second mobile phone, the first mobile portable terminal, according to a Jo Tokoro operation, the message transmitted by the packet transfer network to the second mobile portable terminal through talk destination that are controlled to transition automatically to the message input transmission screen for,
Mobile communication system comprising a call. The mobile communication system according to claim 2, wherein the mobile communication system is controlled to automatically disconnect the line of the circuit-switched communication service when the message input / transmission screen is displayed . After the input message of the first mobile portable terminal is transmitted to the second mobile portable terminal via the packet transfer network in response to a user's transmission instruction operation ,
The first mobile portable terminal is controlled automatically the second mobile portable terminal to recalling the call request by the circuit switched network respect,
The mobile communication system according to claim 3 . The mobile communication system according to claim 1 or 2, wherein the control for automatically transitioning to the message input / transmission screen is executed in accordance with a prior setting.

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