JPH11177713A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal equipment capable of transmitting a reason for rejecting from a call incoming side to a call originating side, when the call-incoming of data communication is rejected by the call-incoming side in data communication. SOLUTION: A CPU 11 of a call-incoming side personal handy phone system(PHS) 8 discriminates that environment for data communication is not prepared, and when specific key operation is executed, sends a response message and also sends a disconnection message of a speech channel. At the time of receiving the disconnection message, a CPU 11 of a call originating PHS 6 temporarily disconnects a communication line. Then, the CPU 11 of the PHS 8 sets and sends the code of a message indicating the reason for a rejection to the subaddress of a call setting message. Then, at the time of receiving the call setting message, including the code of the message indicating the reason for the rejection, the CPU 11 of the PHS 6 sends the disconnection message of the speech channel, analyzes the reason for the rejection, displays the reason on a display part 18 and executes data communication processing according to the reason for the rejection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication terminal device for transmitting and receiving data.

[0002]

2. Description of the Related Art In recent years, portable telephones and PHSs (Personal H
Wireless telephones such as the andyphone System) have rapidly become widespread due to miniaturization and reduction in call charges. In addition, recently, a portable small computer is connected to a mobile phone or a PHS to transmit and receive e-mails, access the Internet, and the like.
Computing (Mobile Computing) is taking root. For this reason, wireless telephones such as mobile telephones and PHSs have come to be regarded as important as means for data communication as well as merely transmitting conversations. This data communication includes PH
In S, PIAFS (PHS InternetAccess Forum) that transmits data at an effective speed of about 29.2 kbit / s
Standard) high-speed data communication.

[0003]

However, in such high-speed data communication according to the PIAFS method, data communication between wireless communication terminals such as PHSs is possible, but the PHS on the receiving side is not capable of data communication. If you are unable to receive incoming data communications, such as when you are not ready, see “Technical Standards / Technical Conditions for Telecommunications Terminal Equipment Approval”.
By "1", the channel is disconnected within one minute from the PHS of the receiving side.

[0004] For this reason, the user on the transmitting side does not know the reason for the disconnection and re-transmits the call, or the PHS on the transmitting side automatically re-transmits the call. There was a problem that could not be received. Further, when data communication is to be rejected in the PHS on the receiving side, there is a problem that transmission may be repeatedly performed from the PHS on the transmitting side.

[0005] An object of the present invention is to provide a communication terminal device capable of transferring the reason for rejection from the called side to the calling side when data receiving is rejected by the called side in data communication. is there.

[0006]

According to the first aspect of the present invention,
In a communication terminal device that performs data communication, when performing data communication, a determination unit that determines whether an environment for data communication is established, and the determination unit determines that the environment for data communication is not established. And a rejection reason transmitting means for transmitting the reason for rejecting the data communication to the partner communication terminal device.

According to the first aspect of the present invention, in a communication terminal device for performing data communication, when performing data communication,
The determining means determines whether or not the data communication environment is ready. If it is determined that the data communication environment is not ready, the reason for rejecting the data communication is determined by the rejection reason transmitting means. Sent to.

According to the first aspect of the present invention, when the environment for data communication is not established, the reason for rejecting data communication is transmitted to the partner communication terminal device, so that the reason for rejecting data communication is determined. It can be clearly transmitted to the terminal device.

According to a second aspect of the present invention, in the first aspect of the present invention, the rejection reason transmitting means determines the reason for rejecting the data communication in response to a specific key operation. It may be configured to transmit to the device.

According to the second aspect of the present invention, when the environment for data communication is not established, the reason for rejecting data communication is transmitted to the partner communication terminal device in response to a specific key operation. The reason for refusal of data communication can be transmitted to the partner communication terminal device at the discretion of the user.

According to a third aspect of the present invention, in the first or second aspect of the invention, the rejection reason transmitting means adds information indicating a reason for rejecting the data communication to a predetermined communication control signal. And transmitting the data to the other party's communication terminal device.

According to the third aspect of the present invention, the data communication rejection reason can be added to the predetermined communication control signal when the data communication rejection reason is transmitted to the partner communication terminal device.

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, there is provided line connection means for connecting a communication line with the partner communication terminal device. After the communication line is connected, the determining means determines whether or not the environment for data communication is established, and the rejection reason transmitting means disconnects the communication line, and then transmits the communication line to the partner communication terminal device. A configuration for transmitting information indicating the reason for rejecting data communication may be employed.

According to the fourth aspect of the invention, when the data communication environment is not established, after disconnecting the communication line, the information indicating the reason for rejecting the data communication is transmitted to the partner communication terminal device. Can be.

According to a fifth aspect of the present invention, in the first, second or third aspect of the present invention, there is provided line connection means for connecting a communication line with the partner communication terminal device. Before the communication line is connected, the determining means determines whether or not the environment of the data communication is ready. The rejection reason transmitting means, before the communication line is connected, May be configured to transmit information indicating the reason for rejecting the data communication.

According to the fifth aspect of the present invention, when the data communication environment is not established, information indicating the reason for rejecting the data communication is transmitted to the partner communication terminal device without connecting the communication line. be able to.

According to a sixth aspect of the present invention, in a communication terminal device for performing data communication, when data communication is not established in the other communication terminal device during data communication, the data is transmitted from the other communication terminal device. Rejection reason receiving means for receiving a reason for rejecting data communication to be performed, rejection reason analyzing means for analyzing the rejection reason received by the rejection reason receiving means, and reporting the rejection reason analyzed by the rejection reason analyzing means. And a notifying means for performing the notification.

According to the invention described in claim 6, in the communication terminal device for performing data communication, when performing data communication,
When the environment of the data communication is not established in the partner communication terminal device, the reason for rejecting the data communication transmitted from the partner communication terminal device is received by the rejection reason receiving unit, and received by the rejection reason analysis unit. The reason for refusal is analyzed, and the notifying means reports the analyzed reason for refusal.

According to the sixth aspect of the present invention, when the partner communication terminal device does not have a data communication environment,
Since the reason for rejecting data communication is sent from the partner communication terminal device, the reason for rejecting data communication is clearly transmitted,
In the communication terminal device, it is possible to prevent the user from making useless retransmission without knowing the reason for the disconnection.

[0020] Further, like the invention according to claim 7, in the invention according to claim 6, there is further provided a data communication processing means for performing data communication processing according to the rejection reason analyzed by the rejection reason analysis means. It may be a configuration.

According to the seventh aspect of the present invention, when the other communication terminal device does not have an environment for data communication,
The communication terminal device can perform processing according to the reason for rejecting the data communication, and can improve the usability of the communication terminal device in data communication.

Further, as in the invention according to claim 8, in the invention according to claim 6 or 7, the notification means responds to a message of a rejection reason analyzed by the rejection reason analysis means or a rejection reason. It may be constituted by display means for displaying a mark or the like.

According to the eighth aspect of the present invention, when the other communication terminal device does not have a data communication environment,
By displaying the message of the reason for refusal or a mark corresponding to the reason for refusal on the communication terminal device, the user can easily confirm the reason for refusal of data communication of the partner communication terminal device.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In this embodiment, a case will be described in which the present invention is applied to PIAFS data communication in PHS.

(First Embodiment) FIGS. 1 to 3 show a first embodiment of a data communication system to which the present invention is applied.

First, the configuration will be described.

FIG. 1 is a diagram showing a schematic configuration of a data communication system 1 according to the first embodiment.

Referring to FIG. 1, a data communication system 1 comprises:
Communication line network 2, control center 3, base station 4,
4, notebook computers 5, 7, PHS 6, 8; control center 3, base stations 4, 4 are connected by communication network 2, and PHS 6, 8
They are connected to the notebook computers 5 and 7, respectively, and wireless communication is performed between the base stations 4 and 4 and the PHSs 6 and 8.

In the first embodiment, in data communication processing 1 to be described later, the PHS 6 will be described as a transmitting side PHS, and the PHS 8 will be described as a receiving side PHS.

The communication network 2 is an integrated service digital network (ISDN) capable of transmitting digitalized data.
vices Digital Network) line, PSTN (Public Swi)
tched Telephone Network)
The network may be independently constructed and connected to a public network.

The control center 3 has PHSs 6 and 8
(A control signal is periodically transmitted from the base stations 4 and 4 to the PHSs 6 and 8, and the PHSs 6 and 8 transmit area information in the control signals. When it changes, the location is registered with respect to the control center 3), and among the plurality of base stations 4, 4, which base station 4 and the PHS 6, 8 are transmitted / received is managed, and each PHS 6, 8 is managed. , The closest base station 4 is allocated to each of the base stations 4 for transmission and reception.

A plurality of base stations 4 are provided in accordance with the area of the service area of the data communication system 1 and the output and the number of PHSs 6 and 8 at the time of transmission. Form a communication line.

The notebook computers 5 and 7 are portable computers, and can transmit and receive data by connecting to the PHSs 6 and 8 via a PC card (not shown) or the like.

FIG. 2 is a block diagram showing the internal configuration of the PHSs 6 and 8 in FIG. In the figure, PHS6, 8
Are a CPU 11, a RAM 13, a storage device 14 having a storage medium 15, a key input unit 16, an interface unit 1.
7, a display unit 18, and a transmission / reception unit 19 having an antenna 20. Each unit except the storage medium 15 and the antenna 20 is connected to a bus 21.

CPU (Central Processing Unit) 11
Is a central processing unit that controls each unit of the PHSs 6 and 8 according to various control programs stored in the storage medium 15 of the storage device 14. Specifically, after the power key of the key input unit 16 is pressed and the initial processing such as initialization is completed, the CPU 11 executes a data communication processing 1 described later.
Execute

First, the CPU 11 of the transmitting side PHS 6 sends out a call for data communication to the receiving side PHS 8. When the CPU 11 of the receiving side PHS 8 detects an incoming call for data communication, the display section 18 displays the incoming call. Is displayed, and it is determined whether or not the environment for data communication is in place. If it is determined that the environment is not in place, it is determined whether or not a specific key operation is performed. If so, a response message is sent out, and the CPU 11
Detects the response message, and then
The CPU 11 of S8 sends a call channel disconnection message, and upon detecting the disconnection message, the CPU 11 of the transmitting side PHS 6 temporarily ends the current data communication.

Then, the CPU 11 of the receiving side PHS 8
When the code of the message of the reason for rejection is set in the destination subaddress and transmitted, the CPU 11 of the transmitting side PHS 6 receives the destination subaddress including the code of the message of the reason for rejection, sends out a call channel disconnection message, and The received reason for refusal is analyzed and displayed on the display unit 18 to perform data communication processing according to the reason for refusal. The CPU 11 of the receiving side PHS 8 detects the disconnection message.

A RAM (Random Access Memory) 13
When various control processes are executed by the CPU 11, a work area for temporarily storing various data to be processed is formed.

The storage device 14 has a storage medium 15 for storing various control programs and data for controlling the respective parts of the PHSs 6 and 8 executed by the CPU 11, such as a data communication process 1 described later. The storage medium 15 is provided such that the storage medium 15 is fixedly provided in the storage device 14 or is detachably mounted. The various control programs are stored in the form of program codes that can be read by the CPU 11.

The data and the like stored in the storage medium 15 may be configured to be received and stored from another device connected via a communication line or the like. A storage device provided in the storage medium may be provided on the other device side, and a program or data stored in the storage medium 14 may be used via a communication line.

The key input unit 16 includes a call key, a numeric keypad,
It has various keys such as a reproduction key, and outputs various operation signals corresponding to each key input operation to the CPU 11.

The interface unit 17 is provided with a P (not shown).
Data connected to and connected to each of the notebook computers 5 and 7 via the C card is transmitted to the notebook computers 5 and 7.
Input and output to

The display unit 18 is composed of a liquid crystal display panel or the like, and displays display data input or instructed from the CPU 11. In the data communication processing 1 executed by the CPU 11, the CPU 11 of the receiving side PHS 8 transmits data. When an incoming call for communication is detected, the incoming of data communication is displayed, and the CPU 1 of the calling side PHS 6 is displayed.
When 1 receives the call channel including the rejection reason and analyzes the rejection reason, it displays the rejection reason.

The transmission / reception unit 19 includes an antenna 20, a modulation circuit, a demodulation circuit, a transmission / reception mixer, and the like.
According to the instruction input from the CPU 11, data transmission and reception are performed, and a control signal transmitted from the base station 4 is received and a signal indicating that the control signal has been received is output to the CPU 11.

Next, the operation of the first embodiment will be described.

The data communication processing 1 executed by the CPU 11 of the transmitting side PHS 6 and the CPU 11 of the receiving side PHS 8 will be described with reference to the flowchart shown in FIG. Note that a call setup message, a response message, a disconnection message, and an option message described later are RC
R (Reseach & Development Center for Radio System
s: a message signal specified by STD-28 of the Radio System Development Center).

First, the CPU 11 of the transmitting side PHS 6 sends a call setting message for data communication (with information indicating data communication in the sub-address) to the receiving side PHS 8 via the base station 4 (step). S1). Callee P
The CPU 11 of the HS 8 connects the communication line when the subaddress of the call setting message sent via the base station 4 includes information indicating that data is passed, and performs the data communication processing based on the data communication protocol. Is started, an incoming call for data communication is made (step A1), and an incoming call display of data communication is displayed on the display unit 18 (step A2). In the case of a normal incoming call (call incoming call),
Perform normal incoming call processing.

Then, the CPU 11 of the receiving side PHS 8
It is determined whether or not the data communication environment such as whether the receiving side PHS 8 is connected to the notebook computer 7 is established (step A3).
Normal data communication is performed (step A4). The determination as to whether or not the data communication environment is ready is made, for example, by the notebook computer 7 (the interface unit 1).
7) A confirmation code is sent, and there is a response from the notebook computer 7, and it is determined whether or not the data communication environment is ready based on the response.

If the environment of data communication is not established in step A3, data communication by the data communication protocol cannot be performed. It is determined whether a key operation has been performed (step A5).
If no specific key operation is performed for a predetermined time, the caller P
Sends a response message to HS6 (step A
6) The CPU 11 of the transmitting side PHS 6 receives the response message (step S2),
The CPU 11 of the transmission side 8 transmits a disconnection message of the communication channel to the transmitting side PHS 6 (step A7), and the CPU 11 of the transmitting side PHS 6 receives the disconnection message (step S3) and disconnects the communication line.

In step A5, if a specific key operation is performed within a predetermined time, the receiving side PHS 8
Sends a response message to the transmitting side PHS 6 (step A8), and the CPU 11 of the transmitting side PHS 6
11 receives the response message (step S
2) Then, the CPU 11 of the called side PHS 8 sends a disconnection message to the calling side PHS 6 (step A).
9) Upon receiving the disconnection message (step S3), the CPU 11 of the transmitting side PHS 6 disconnects the communication line.

After disconnecting the communication line, the CPU 11 of the receiving side PHS 8 sets the data (code) of the message of the reason for rejection of the incoming call in the destination sub-address area of the call setting message, and sends the data to the calling side PHS 6. Upon transmission (step A10), the CPU 1 of the transmitting side PHS 6
1 determines whether or not an incoming call is received (a call setting message is received) and data (code) of a rejection reason message is detected in the subaddress of the call setting message (step S4). The code of the message of the rejection reason is set in advance for the rejection reason such as “data communication environment preparation” or “data communication rejection”.

In step S4, if the incoming call is a normal incoming call, the CPU 11 of the transmitting side PHS 6 performs a normal incoming call process. On the other hand, when the code of the message of the rejection reason is detected in the sub-address, a disconnection message of the communication channel is sent to the receiving side PHS 8 (step S5), and the code of the received message of the rejection reason is analyzed ( (Step S6), the reason for refusal is displayed on the display unit 18 (Step S7), and data communication processing is performed according to the reason for refusal, such as delaying the transmission time of data communication or temporarily terminating data communication (Step S6). Step S
8). Further, the CPU 11 of the receiving side PHS 8 detects the disconnection message of the communication channel (step A1).
1), end this processing.

As described above, the CPU 1 of the receiving side PHS 8
Reference numeral 1 indicates that when a specific key operation is performed by the user when the environment for data communication is not established, the communication line is temporarily disconnected. And then, the CPU of the receiving side PHS8
11 sets the destination sub-address of the call setup message to the data (code) of the message of the reason for rejection and sends the call;
When the CPU 11 of the transmitting side PHS 6 receives the call setting message including the code of the message of the rejection reason,
The display unit 18 indicates the reason why the communication line was disconnected (the reason for refusal such as “preparing for data communication environment” or “rejection of data communication”).
And performs data communication processing according to the rejection reason.

Therefore, the reason for rejecting data communication in the PHS on the receiving side can be clearly communicated to the PHS on the calling side, and useless retransmission is performed without knowing the reason for disconnection in the PHS on the calling side. Can be prevented.

Further, in an environment where the PHS on the receiving side cannot receive data communication, the reason for rejecting data communication is transmitted to the PHS on the calling side in response to a specific key operation. The reason for refusal of data communication in the PHS on the transmitting side can be clearly communicated to the PHS on the transmitting side.

Further, in an environment in which the PHS of the receiving side cannot receive data communication, the code of the message of the rejection reason transmitted from the PHS of the receiving side is analyzed by the PHS of the transmitting side, and processing according to the rejection reason is performed. To the calling party's PH
By performing S, usability of PHS in data communication can be improved.

Further, in an environment where the PHS on the receiving side cannot receive data communication, a message corresponding to the reason for rejection transmitted from the PHS on the receiving side is displayed on the PHS on the transmitting side, thereby displaying the message on the transmitting side. In the PHS, the user can easily confirm the reason for rejecting the data communication of the PHS on the receiving side.

(Second Embodiment) In the first embodiment, if the PHS on the receiving side cannot receive data communication after connecting the communication line, the communication line is temporarily disconnected and then rejected. Reason message data (code)
Is transmitted to the caller's PHS by transmitting the call setup message in which is set, but when the communication line is disconnected, before transmitting the disconnection message, the data (code ) Is added to the option message (or response message) and transmitted, so that the reason for rejection can be transmitted to the PHS on the calling side without connecting the communication line, which is effective.

In the second embodiment, in an environment where the PHS on the receiving side cannot receive data communication, after transmitting a response, a message indicating a rejection reason is placed in the option area of the option message when the communication channel is disconnected. By transmitting the disconnection message after adding the message, the reason for rejection in one data communication can be determined by the calling party's PH.
A data communication system capable of transmitting data to S will be described.

FIGS. 4 and 5 are diagrams showing a second embodiment of the data communication system to which the present invention is applied.

The main configuration of the data communication system according to the second embodiment is the same as the system configuration shown in FIG. 1 of the first embodiment, so that illustration and description thereof are omitted.

In the second embodiment, the first
Similar to the embodiment, in the data communication processing 2 described below, the PHS 6 will be described as the transmitting side PHS, and the PHS 8 will be described as the receiving side PHS.

Further, FIG. 1 in the second embodiment
Since the internal configuration of the PHSs 6 and 8 is the same as the internal configuration shown in FIG. 2 of the first embodiment, illustration and description are omitted.

In the second embodiment, the transmitting side PHS 6
The data communication process 2 executed by the CPU 11 of the receiving side PHS 8 and the CPU 11 of the receiving side PHS 8 will be described based on the flowchart shown in FIG.

First, the CPU 11 of the calling side PHS 6 sends a call setting message (for example,
The information to the effect of data communication is described in the sub-address and transmitted (step B1). CPU 11 of the receiving side PHS8
Receives the call setting message sent from the CPU 11 of the calling side PHS 6, and if it is an incoming call for data communication (step C1), causes the display unit 18 to display the incoming call of the data communication (step C2).

Then, the CPU 11 of the receiving side PHS 8
Whether or not the data communication environment such as whether the receiving side PHS 8 is connected to the notebook computer 7 or not (as described above, whether the data communication environment is ready or not is determined, for example, by the note A confirmation code is sent to the portable computer 7 (to the interface unit 17), and a response is received from the portable computer 7, and it is determined whether or not the data communication environment is established based on the response (step C3). If it is determined that the communication is established, a communication line is connected and normal data communication is started based on a predetermined communication protocol (step C4).

When it is determined that the data communication environment is not established, the CPU 11 of the receiving side PHS 8 sends a response message to the transmitting side PHS 6 (step C5), and the CPU 11 of the transmitting side PHS 6 The response message is received (step B2). Next, the CPU 11 of the receiving side PHS 8 stores a rejection reason message (“preparing data communication environment”) in the data area of the option message a (having at least a protocol identifier, a message type (optional) and data) shown in FIG.
Or "data communication rejection") (step C6).
The CPU 11 of the transmitting side PHS 6 receives the option message a (step B3).

Then, the CPU 11 of the receiving side PHS 8
A call channel disconnection message is sent to the calling side PHS 6 (step C7), and the CPU 1 of the calling side PHS 6
1 receives the disconnection message (step B
4). Thus, the connection process ends without connecting the communication line.

Next, the CPU 11 of the transmitting side PHS 6
The message data (code) of the reason for refusal added to the detected option message a is analyzed (step B5), and the reason for refusal is displayed on the display unit 18 (step B6). Data communication processing according to the reason for refusal, such as delaying or temporarily ending data communication, is performed (step B7), and this processing ends.

As described above, the CPU 1 of the receiving side PHS 8
If it is determined that the data communication environment is not established during the connection process, the connection message 1 is transmitted after adding the message data (code) of the rejection reason to the option message a. Then, the CPU 11 of the transmitting side PHS 6
Analyzes the rejection reason from the code of the rejection reason message added to the received option message a, causes the display unit 18 to display the rejection reason, and performs data communication processing according to the rejection reason.

Therefore, the reason for rejection can be transmitted to the PHS on the calling side without connecting the communication line.

In the second embodiment, the option message is used. However, if the data (code) of the message of the rejection reason is added to the facility area of the response message, the option message is not used, and only the normal procedure is used. Can be implemented.

In the present embodiment, the display text is displayed on the transmitting side PHS based on the message of the rejection reason transmitted from the receiving side PHS. Alternatively, a speaker may be provided to perform sound notification by an alarm according to the reason for refusal.

Further, in the present embodiment, the notebook computer is connected to the PHS using a PC card to perform data communication. However, data communication using a portable terminal device having a built-in PHS function is also possible. Applicable.

Further, in the present embodiment, PHS
Although the description has been given of the case where the present invention is applied to the data communication protocol based on the PIAFS method in the above, the function of the present invention may be added according to the data communication protocol based on another method of the PHS.

Further, in this embodiment, the case where the present invention is applied to the data communication protocol in the PHS has been described.
The present invention is not limited to the HS, and may have a configuration in which the function of the present invention is added according to the data communication protocol of a mobile phone or a data communication device connected by a wire. For example, it can be applied to a facsimile, a digital camera with a communication function, and the like.

[0078]

According to the first aspect of the present invention, when the environment for data communication is not established, the reason for rejecting data communication is transmitted to the other communication terminal device, so that the reason for rejecting data communication can be determined. It can be clearly transmitted to the communication terminal device.

According to the second aspect of the present invention, when the environment for data communication is not established, the reason for rejecting data communication is transmitted to the other party's communication terminal device in response to a specific key operation. According to the determination, the reason for rejection of the data communication can be transmitted to the partner communication terminal device.

According to the third aspect of the present invention, the data communication rejection reason can be added to the predetermined communication control signal when transmitting the data communication rejection reason to the partner communication terminal device.

According to the fourth aspect of the invention, when the environment for data communication is not established, after disconnecting the communication line, information indicating the reason for rejecting the data communication can be transmitted to the partner communication terminal device. it can.

According to the fifth aspect of the present invention, when the data communication environment is not established, the information indicating the reason for rejecting the data communication is transmitted to the partner communication terminal device without connecting the communication line. Can be.

According to the sixth aspect of the present invention, the reason for rejecting data communication is transmitted from the partner communication terminal device when the environment of data communication of the partner communication terminal device is not established. The reason is clearly transmitted, and it is possible to prevent the communication terminal device from performing unnecessary retransmission without knowing the reason why the user was disconnected.

According to the seventh aspect of the present invention, when the environment of the data communication of the partner communication terminal device is not established, the communication terminal device can perform processing according to the reason for rejecting the data communication. Usability of the communication terminal device in communication can be improved.

According to the invention described in claim 8, when the environment of data communication is not established in the partner communication terminal device, a message of a rejection reason or a mark corresponding to the rejection reason is displayed on the communication terminal device. Thus, the user can easily confirm the reason for refusal of the data communication of the partner communication terminal device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a data communication system 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of PHSs 6, 8 in FIG. 1 in the present embodiment.

FIG. 3 is a block diagram showing a first embodiment of the present invention;
9 is a flowchart showing a data communication process 1 executed by the CPU 11 of the receiving side PHS 8.

FIG. 4 is a block diagram of a second embodiment of the present invention;
9 is a flowchart showing a data communication process 2 executed by the CPU 11 of the receiving side PHS8.

FIG. 5 is a diagram showing a receiving-side PHS 8 in the second embodiment.
FIG. 7 is a diagram showing an option message a transmitted from the PHS 6 to the transmitting side.

[Explanation of symbols]

 Reference Signs List 1 data communication system 2 communication line network 3 control center 4 base station 5, 7 notebook computer 6, 8 PHS 11 CPU 13 RAM 14 storage device 15 storage medium 16 key input unit 17 interface unit 18 display unit 19 transmission / reception unit 20 antenna 21 Bus a Option message

Claims (8)

[Claims] In a communication terminal device for performing data communication, when performing data communication, a determining means for determining whether or not an environment for data communication is established; and by the determining means, an environment for data communication is established. And a rejection reason transmitting means for transmitting a reason for rejecting the data communication to the partner communication terminal device when it is determined that the communication terminal device does not have the data communication device. 2. The communication terminal device according to claim 1, wherein said rejection reason transmission means transmits a reason for rejecting said data communication to said partner communication terminal device in response to a specific key operation. 3. The communication device according to claim 1, wherein said rejection reason transmitting means adds information indicating a reason for rejecting the data communication to a predetermined communication control signal and transmits the signal to the partner communication terminal device. The communication terminal device according to claim 1. 4. A communication system comprising: a line connection unit for connecting a communication line with the communication terminal device; and, after the communication line is connected by the line connection unit, the determination unit determines whether an environment for data communication is established. Determining whether or not the rejection reason transmitting means, after disconnecting the communication line,
4. The communication terminal device according to claim 1, wherein information indicating a reason for rejecting the data communication is transmitted to the partner communication terminal device. 5. A data communication system comprising: a line connection unit for connecting a communication line with the communication terminal of the other party; and before the communication line is connected by the line connection unit, the determination unit sets an environment for data communication. Determining whether or not the data communication is rejected, wherein the rejection reason transmitting means transmits information indicating a reason for rejecting the data communication to the partner communication terminal device before the communication line is connected. 4. The communication terminal device according to 2, 3 or 4. 6. A communication terminal device for performing data communication, which rejects data communication transmitted from the partner communication terminal device when data communication environment is not established in the partner communication terminal device during data communication. Rejection reason receiving means for receiving the reason for rejecting, Rejection reason analyzing means for analyzing the rejection reason received by the rejection reason receiving means, Notification means for notifying the rejection reason analyzed by the rejection reason analysis means, A communication terminal device comprising: 7. The communication terminal device according to claim 6, further comprising data communication processing means for performing data communication processing according to the rejection reason analyzed by said rejection reason analysis means. 8. The reminding means according to claim 6, wherein said notifying means is display means for displaying a message of the rejection reason analyzed by said rejection reason analyzing means, a mark or the like corresponding to the rejection reason. Communication terminal device.