JP2791634B2 - Wireless terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication with a base station connected to a center device via a telephone line or the like.
The present invention relates to a wireless terminal device that accesses a center device via a base station and communicates various information.

[0002]

2. Description of the Related Art A radio terminal device of this type is called a teleterminal, and a teleterminal system including these teleterminals is configured as shown in FIG. That is, in FIG. 3, 1 the center apparatus, ₂₁ to ₂₄
Is a wireless terminal device which is the base station, 3 ₁ to 3 ₅ are wirelessly connected to the base station ₂₁ to ₂₄ are connected via a line L, such as the center apparatus 1 and the telephone line.

[0003] By the way, such a wireless terminal device 3 has an 8
Communication is performed with the base station 2 at a radio frequency of 00 MHz, and the object to be handled is not a voice signal but a data signal.
Therefore, each person has such a wireless terminal device,
If the message is bidirectionally communicated as a data signal via the center device 1 and displayed on the display of each wireless terminal device, the message can be accurately transmitted to the other party. Therefore, the wireless terminal device can be effectively used for an ordering management system, a maintenance service support system, a construction site information management system, a vehicle dynamics management system, and the like. Further, since this wireless terminal device is portable, a battery is used as a power source, and about 7 W (watt) of power is consumed during transmission. The mobile station is in a standby state except during transmission, and receives a call from the base station and receives message information from the base station based on the call.

[0004]

However, when such a wireless terminal device is used in a vehicle, a communication error frequently occurs especially during traveling of the vehicle, and a message from a partner device via a base station is received. There is a problem that can not be.

Accordingly, an object of the present invention is to accurately receive a message from a partner device when a wireless terminal device is used in a vehicle.

[0006]

SUMMARY OF THE INVENTION The present invention in order to solve such a problem is connected with the base station and the radio channel which is connected to the center device through a wired line such as a telephone line, vehicles in the wireless terminal device mounted on a reception status determining means for determining whether or not a predetermined time stable reception status via a radio channel, the stop of the vehicles when the judgment output of the reception status determining means is negative The vehicle stop detecting means is provided, and a mail calling means for accessing the center device and extracting message information in accordance with the detection output of the vehicle stop detecting means is provided. Also includes a vehicle speed signal input means for inputting a vehicle speed signal of the vehicle, the vehicle stop detection means is obtained to detect the stop of the vehicle based on the vehicle speed signal from the vehicle speed signal input means. Also the vehicle
Equipped with a car navigation device that outputs a position signal of
The vehicle stop detecting means includes the car navigation device.
Stop of the vehicle is detected based on the position signal from the
It is a thing.

[0007]

[Action] When the wireless terminal device used in a vehicle communicates with the base station, the reception status of the radio channel is determined not to be stable, and detecting the stop of the vehicles, the center corresponding to the detection output Access the device and retrieve message information. As a result, when the vehicle travels, the reception state of the wireless line becomes unstable, a communication error occurs with the base station, and the message information destined for the wireless terminal device stored in the center device from the base station is: When the vehicle stops, the wireless terminal device automatically extracts the message information, so that it is possible to accurately receive the message information from the partner device that cannot be received at the time of the communication error. In addition, the vehicle stops when the vehicle speed sensor
It is detected based of zero vehicle speed signal from the vehicle speed signal input means. As a result, the stop of the vehicle can be easily detected. Also, the vehicle may be driven based on a position signal from the navigation device.
Both stops can be detected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a wireless terminal device according to the present invention. In this figure, a CPU 31 is provided in the wireless terminal device 3, and an LCD unit 32 for performing various displays and an A / D converter 33 are connected to the CPU 31. Here, the A / D conversion unit 33
The voltage level signal from the touch key section 34 is converted into a digital signal and transmitted to the CPU 31. The touch key section 34 is formed of a group of resistors, and
When each operation key or the like displayed on the display screen of the LCD unit 32 is pressed down, it generates each voltage level signal in the X and Y directions according to the pressed position. This voltage level signal corresponds to A
The signal is converted into a digital signal by the / D converter 33 and transmitted to the CPU 31 as an operation signal.

The CPU 31 is connected to a buzzer 35 that sounds when an incoming call is received, a clock unit 36, and a modem unit 37. Here, the modem unit 37 sends the data signal from the CPU 31 to the wireless transmission / reception unit 38 and sends the data signal to the base station 2 shown in FIG.
To the base station 2 via the radio transceiver 38.
When a data signal is received from the
31.

Further, since the wireless terminal device 3 is portable, a battery 39 is used as a power source, and a power source control unit 40
Converts the output voltage of the battery 39 and supplies it as an output voltage V to each unit of the device. When the battery 39 is consumed and its voltage level decreases, the battery 39 is charged by the charger 50. The CPU 31 has an ID ROM 41 in which the ID number of the device is registered, a RAM 42 for storing data,
And a signal line 43 for detecting a wireless reception electric field strength via a wireless transmission / reception unit 38. Other CPU
31 shows the vehicle 6 when this device is mounted on the vehicle 6.
And a signal line 44 for inputting a vehicle speed signal from a vehicle speed sensor 61 provided in the vehicle 6 and a navigation device (GPS; Global Positioning) of the vehicle 6.
A signal line 45 for inputting a position signal used in the System 62 is connected.

When an operation signal is input from the touch key unit 34 via the A / D conversion unit 33, the CPU 31 performs predetermined processing and displays the processing result on the LCD unit 32. When this display screen is transmitted to, for example, a partner device, after calling the partner device, the display screen data is transmitted to the base station 2 shown in FIG. 3 via the modem unit 37, the wireless transmission / reception unit 38, and the antenna AT. Send as As a result, the display screen data is transmitted to the base station wirelessly connected to the partner device via the base station 2 and the center device 1 in the area of the transmitting device, and further transmitted to a desired partner device for display. . The display screen data transmitted from the partner device is received by the CPU 31 via the antenna AT, the wireless transmission / reception unit 38, and the modem unit 37, and is similarly displayed on the LCD unit 32. As described above, the present apparatus can perform two-way communication of a data signal such as display screen data with a partner apparatus.

By the way, when such a wireless terminal device 3 is used in the vehicle 6, a communication error frequently occurs with the base station 2 especially while the vehicle 6 is running. There is a case where the message of the partner device cannot be received because the call cannot be answered. For this reason, in the present embodiment, when the vehicle speed signal from the vehicle speed sensor 61 mounted on the vehicle 6 becomes zero and it is determined that the vehicle 6 has stopped, the electronic mail section of the center device 1 is transmitted via the base station 2. Access and retrieve messages addressed to the terminal. In addition, the position signal used by the vehicle navigation device 62 is monitored, and if it is determined from the position signal that the vehicle is stopped, the electronic mail unit of the center device 1 is accessed in the same manner, and Retrieve messages.

That is, a communication error frequently occurs between the base station 2 and the wireless terminal device 3 mounted on a running vehicle, for example, so that the wireless terminal device 3 cannot respond to a call from the base station 2. In this state, the message addressed to the wireless terminal device 3 from the partner terminal device is stored in the e-mail section in the center device 1. In this case, the wireless terminal device 3
Determines that the communication with the base station 2 has recovered to a good state when detecting the stop of the vehicle, accesses the center apparatus 1 via the base station 2, and when the communication state is poor, the center apparatus 1 Is transmitted from the center device 1 to the base station 2 via the base station 2. Then, it receives the transmitted message and performs display on the LCD unit 32 and the like.

FIG. 2 is a flow chart showing the operation of the CPU 31 of the wireless terminal device 3 showing a mail calling operation for extracting such a message addressed to the terminal from the center device. According to this flowchart, the operation of the main part of the present invention will be described in more detail. The CPU 31 detects the strength of the received electric field intensity in the wireless transmission / reception unit 38 via the signal line 43 except when transmitting to the base station 2, and also outputs the data signal from the base station 2 via the wireless transmission / reception unit 38 and the modem unit 37. The reception status of the apparatus is monitored based on the time information from the clock unit 36, and it is determined in step ST1 whether the reception status of the apparatus is stable for a certain period, for example, 30 seconds.

If it is determined that the reception has not been stabilized for 30 seconds, then it is determined in step ST2 that the vehicle 6 has stopped. This determination of the stop of the vehicle 6 is made based on the vehicle speed signal from the vehicle speed sensor 61 being zero or the position signal from the navigation device 62 (receiving the same position signal for a certain period of time) as described above. If the stop of the vehicle 6 cannot be detected, the process returns to step ST1, and if the stop of the vehicle 6 is detected, the process proceeds to step ST3.

At step ST3, the center device is accessed to retrieve a message addressed to the terminal itself. The current time information of the clock section 36 and whether or not a predetermined time has elapsed since the previous mail call is stored in the RAM 42 at the time of the last mail call. Judgment is made from the time information. If the predetermined time has not elapsed since the last e-mail call, it is determined that there is no possibility that a message addressed to the terminal itself is newly stored in the center device, and the process returns to step ST1.

If the fixed time has not elapsed since the last mail call, it is determined that there is a high possibility that a new message addressed to the own terminal is stored in the center device. In this case, the center device 1 is accessed via the base station 2 in step ST4, and an inquiry is made as to whether there is a message addressed to the terminal itself. If there is a message addressed to the terminal itself, the message is sent from the center device 1 to the base station 2.
Via the Internet. When the CPU 31 receives a message addressed to the terminal itself transmitted from the center device via the base station 2 via the antenna AT, the wireless transmission / reception unit 38 and the modem unit 37, it performs processing such as displaying on the LCD unit 32.

When the wireless terminal device 3 mounted on the vehicle 6 has a communication error with the base station 2 when the vehicle 6 is running, the base station 2 transmits a message addressed to the terminal device 3. While stored in the center device, the wireless terminal device 3
When the stop of the vehicle 6 is confirmed, the center device 1 is accessed to extract a message addressed to the terminal from the center device 1. As a result, when the wireless terminal device is used in a vehicle, a message from a partner device can be accurately received.

[0019]

According to the present invention described above, according to the present invention, when the wireless terminal device used in a vehicle communicates with the base station, the reception status of the radio channel is determined not to be stable, car Since both stops are detected and the center device is accessed and the message information is taken out according to the detection output, the reception state becomes unstable when the vehicle is running, and the radio signal stored in the center device from the base station is stored in the center device. The message information addressed to the terminal device is automatically taken out when the vehicle stops, so that the message information from the partner device that has become unreceivable at the time of the communication error can be accurately taken out and received. In addition, the stop of the vehicle is notified by the vehicle speed signal input means.
Since the detection is performed based on the signal, when the wireless terminal device mounted on the vehicle detects the stop of the vehicle, the detection can be easily performed. Also, the position from the navigation device
Vehicle stoppage can be detected based on the signal,
Automatically retrieves message information when stopped
From the partner device that could not be received at the time of the communication error.
Message information can be accurately retrieved and received.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a wireless terminal device according to the present invention.

FIG. 2 is a flowchart showing the operation of the above device.

FIG. 3 is a diagram showing a configuration of a teleterminal system to which the above device is applied.

[Explanation of symbols]

1 center device ₂₁ to ₂₄ base stations 3 ₁ to 3 ₅ wireless terminal device 6 vehicle 31 CPU 36 clock unit 37 modem 38 wireless transceiver 42 RAM 43 to 45 signal lines 61 a vehicle speed sensor 62 navigation device AT Antenna

Claims (3)

(57) [Claims] 1. A is connected by a base station and a radio network which is connected to the center device through a wired line such as a telephone line, in the wireless terminal device mounted on vehicles, the reception status via the radio channel a reception status determining means for determining whether or not the stability constant time, the vehicle stop detecting means for determining an output of the reception status determining means detects the stop of the previous SL vehicle when not, the vehicle stop detecting means And a mail calling means for accessing the center device and extracting message information in response to the detection output of the wireless terminal. In the wireless terminal device 2. A method according to claim 1, further comprising a vehicle speed signal input means for inputting a vehicle speed signal of the vehicle, the vehicle stop detection means, based on the vehicle speed signal from the previous SL vehicle speed signal input means A wireless terminal device for detecting a stop of the vehicle. 3. The wireless terminal device according to claim 1, wherein A car navigation device for outputting a position signal of the vehicle
Wherein the vehicle stop detecting means includes the car navigation system.
Stopping the vehicle based on the position signal from the
A wireless terminal device for detecting.