JP2870077B2 - Car phone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a mobile telephone device in which a base unit and a slave unit (hereinafter, referred to as a handset) of a mobile wireless device are wirelessly connected (hereinafter, referred to as cordless). In particular, the caller is notified of a call-disabled state due to out of service area or the like.

B. Prior Art Conventionally, as a mobile wireless device in an automobile telephone system, a wireless device in which a base unit and a handset are cordless has been known. This device is, for example, as shown in FIG.
An on-vehicle mobile device main body 2 having an antenna 1;
And a handset 4 cordlessly connected to the base unit 3. The signal transmission system for realizing the cordless system is, for example, a guiding system mainly using radio waves or light as disclosed in Japanese Patent Application Laid-Open No. 56-396439.

The reason for becoming cordless is to prevent the occurrence of malfunctions, such as the cord being cut due to excessively strong force being applied, and to improve ease of use by allowing free calls in any seat in the passenger compartment. It is in.

C. Problems to be Solved by the Invention However, in this cordless mobile radio, from the viewpoint of effective use of the used frequency and reduction of power consumption, the base unit 3 and the handset 4 are connected only when a call is made. The transmission and reception of radio waves are performed between them.

Therefore, the allowance for the problem associated with the cordless operation specific to the mobile phone is insufficient, and a situation arises in which the caller cannot determine whether or not the mobile radio is in a callable state. In other words, there is a problem that the handset cannot monitor whether the vehicle is currently within the service area of the car telephone system.

A technical problem of the present invention is to always notify a mobile party of whether a mobile phone is within service area or out of service area while effectively using radio waves between a vehicle-mounted telephone body and a handset and saving power. .

D. Means for Solving the Problems To be described with reference to FIGS. 1 and 2 showing an embodiment, the present invention relates to an in-vehicle telephone body for performing wireless communication with a base station.
2 and 3 and a handset 4 for performing wireless communication with the in-vehicle telephone bodies 2 and 3.
To a mobile telephone device that communicates with a base station by relaying a call.

Then, to the in-vehicle telephone bodies 2 and 3, a determination means 25 for determining whether the service area of the car phone is within the service area or not, and a transmission means 35 for transmitting the in-area signal or the out-of-area signal for a predetermined time when the determination of the determination means 25 is switched. , 36, and receiving means 5, 41, 42 for receiving the in-range signal and out-of-range signal on the handset 4, display means 46 for displaying whether the service area of the car telephone is in the service area or out of the service area, and receiving means 5, 41, The display means 46 at the time when the in-range signal or the out-of-range signal is received by 42
Switching means 45 for switching between the in-service area and out-of-service display.

E. Operation The in-vehicle signal or the out-of-range signal is wirelessly transmitted from the in-vehicle telephone bodies 2 and 3 to the handset 4 for a certain period of time when the determination as to whether the vehicle is in the service area or out of the service area is switched. The handset 4 switches between the in-range / out-of-range display when the in-range signal or the out-of-range signal is received from the in-vehicle telephone bodies 2 and 3.

In the above sections D and E for describing the configuration of the present invention, the drawings of the embodiments are used for easy understanding of the present invention, but the present invention is not limited to the embodiments.

F. Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5. In FIG. 1, reference numeral 1 denotes an antenna mounted on a vehicle body;
Reference numeral 2 denotes a mobile device main body mounted on a vehicle, and reference numeral 3 denotes a parent device connected to the mobile device main body 2.

The mobile device body 2 includes a duplexer 21 having a coupler and a filter, a receiver 22 having a mixer and a demodulator, a transmitter 24 having a modulator and a power amplifier, switching frequencies and setting channels to be used. The frequency synthesizer 23 includes a control unit 25 for controlling the entire mobile device main body, and the used frequency band is, for example, an 800 MHz band.

Here, the control unit 25 determines whether the reception level of the incoming call control channel (P-CH) transmitted from the radio base station (not shown) is equal to or higher than a predetermined value. "OFF" signal is output.
Outputs N "signal.

The base unit 3 has a configuration similar to that of the mobile unit body 2 and includes a transmission / reception duplexer 31, a reception unit 32, a transmission unit 34, a frequency synthesizer 33, a control unit 35, and an antenna 36. The transmission band uses the 380 MHz band, and the handset 4
Uses a 250 MHz band. Further, the antenna 36 is built in the housing or attached to a center console, a rear parcel, a pillar, or the like in the vehicle interior.

Here, the control unit 35 of the base unit 3 performs the following three controls.

When a change from one of the “out of service display OFF” signal and the “out of service display ON” signal by the mobile device body 2 to the other is detected, 3
The data of the “out-of-service display OFF signal” or the “out-of-service display ON signal” is placed on the control channel of the 80 MHz band and transmitted to the handset 4 for a certain period of time. Hereinafter, the out-of-service display OFF signal and the ON signal are referred to as out-of-service display control signals.

Responds to an inquiry from the handset 4 described later.

When there is no inquiry from the handset 4 within a predetermined time, a message indicating that the call cannot be answered is sent to the caller or a caller's voice recording function such as recording of the caller's voice is activated. If an inquiry from the handset 4 is received within a predetermined time, the missed call function is stopped by the control unit 35.

FIG. 2 shows the configuration of a portable handset 4 of the mobile radio. This handset 4 is 380MHz
Control for controlling the entire operation of the duplexer 41, the receiving unit 42, the frequency synthesizer 43, the transmitting unit 44, and the handset as well as the mobile unit 2 and the base unit 3 in addition to the antenna 5 for receiving the band and transmitting the 250 MHz band. A part 45 is provided. In addition, liquid crystal
Out-of-service indicator 46 such as an LED, keyboard 47 for inputting a dial number necessary for making a call, and performing on-hook and off-hook operations, a receiver 48a and a speaker 48b necessary for a call, and a transmitter 49
Also equipped with a and microphone 49b. The handset 4 having such a configuration is mounted on a stationary table or a housing of the base unit 3 when not in use.

Here, the control unit 45 of the handset 4 performs the following three controls.

When the "out-of-service display signal" changes from OFF to ON by the base unit 3, data is received for a certain period of time, and when OFF to ON, the out-of-service indicator 46 for notifying the communication disabled state due to out of service is provided.
When it is turned ON, and when ON → OFF, the out-of-area indicator 46 is turned OFF.

Sends an inquiry signal to the base unit 3 at regular intervals,
When there is no response from base unit 3, base unit 3 and handset 4
"Out of service area" indicating that communication with the server is disabled.

The call setting operation from the handset 4 is enabled by setting the line within the service area and by setting the base unit 3 and the handset 4 together.

The configuration of the mobile wireless device and the functions of the control units 25, 35, and 45 of the mobile device body 2, the master device 3, and the handset 4 have been described above. Referring to the flowcharts of FIGS. The operation of the mobile radio will now be described.

FIG. 3 relates to the master unit 3. In the standby state of the base unit 3, it is determined whether or not the out-of-service display signal from the mobile unit body 2 has changed (step S101), and if there has been no change, it is determined by the timer whether or not a predetermined time has elapsed (step S101).
S102). If the predetermined time has not elapsed, it is determined whether there is a call signal from the handset 4 (step S103), and if not, it is determined whether there is a call signal from the line (step S104).

When the call signal is received in step S103, the step
In S105, a calling operation is performed according to the calling sequence, and a call is made from the mobile device body 2 to the wireless base station. Further, when the call signal is received in step S104, step S106
An incoming call operation is performed according to the incoming call sequence, and the handset 4 sounds a ringing tone.

When the change of the out-of-service signal is determined in step S101, it is determined in step S107 whether the change of the out-of-service signal is from OFF to ON. The change from OFF to ON corresponds to the change from the service area to the outside of the service area, and the data of the out-of-service display ON signal is put on the control channel and transmitted for a certain time (step S109). vice versa,
The change from ON to OFF corresponds to a change from outside the service area to the service area. In step S108, the data of the out-of-service display OFF signal is placed and transmitted for a predetermined time.

In step S102, a predetermined time has elapsed (for example, three minutes or five
When the minute is detected, it is determined in step S110 whether an interlock signal has been received from the handset 4 during that time. If the radio wave has not arrived and communication is not possible, that is, if the inquiry signal has not been received, the missed arrival new function is started in step S111, and if it has been received, the missed call reception function is stopped (step S112).

FIG. 4 relates to the handset 4. In the standby state of the handset 4, first, it is determined whether an off-hook operation has been performed by the keyboard 47 (step S2).
01), if not, it is determined whether an incoming call signal has been received (step 202). If step S202 is denied, it is determined whether or not the out-of-service display control signal has been received (step S203), and if denied, it is determined whether or not a predetermined time has elapsed (step S209).

When off-hook is determined in step S201, a calling operation is performed according to a calling sequence (step S204).
When an incoming call signal is received in step S202, an incoming call operation is performed in accordance with the incoming call sequence (step S205), and a ringing tone sounds.

In step S203, if the out-of-service display control signal shown in FIG. 5 is received, it is determined in step S206 whether the signal is an out-of-service display ON signal. Display is performed (step S207), and the display output is continued thereafter. In the case of the out-of-service display OFF signal, the out-of-service display by the out-of-service display 46 is stopped (step S208), and the state is continued thereafter.

Here, the out-of-service display control signal is extremely short data composed of a plurality of bits of an identification code indicating this signal and one bit of ON or OFF, does not require transmission time, and therefore occupies the control channel. Time does not matter.

The out-of-service indicator 46 may be a display for confirming a dial number or the like, a buzzer or the like, and may be provided with a single indicator light or the like.

When the elapse of the predetermined time is detected in step S209, inquiry communication data is transmitted from the handset 4 to the base unit 3 in step S210, and a response from the base unit 3 is waited for (step S211). At this time, if there is no response, it is determined that the line setting between the base unit 3 and the handset 4 cannot be performed, and the out-of-service area display of the parent-child section is performed in step S212. This can be performed by a separate display device, the same display device 46, or various methods. Conversely, if there is a response, the line is set and communication is possible, and the out-of-service display between the parent and child is deleted in step S213. The out-of-service display at this time may be performed by sounding a buzzer.

According to such an embodiment, the mobile device main body 2 determines whether the vehicle is in the service area or out of the service area, and the result of the determination is constantly transmitted to the base unit 3. Then, base unit 3 sends an out-of-service display control signal to turn on or off the out-of-service display 46 to handset 4 only when the determination result changes. Therefore, whether or not a call can be made is always displayed on the handset 4 with a small amount of power consumption. Also,
Assuming that a call cannot be made due to the distance between the handset 4 and the base unit 3 being equal to or greater than a predetermined value, it is also determined whether or not such a call can be made. Is displayed. In this case, the missed call function on the base unit can be turned on to notify the caller that the call cannot be received in response to a call from the fixed station or another mobile station.

In the configuration of the above embodiment, the mobile unit main body 2 and the base unit 3 are the vehicle telephone main body, the handset 4 is the handset, the control unit 25 is the determining unit, the control unit 35 and the antenna 36 are the transmitting unit, 5, the duplexer 41 and the receiving unit 42 constitute a receiving unit, the out-of-service indicator 46 constitutes a display unit, and the control unit 45 constitutes a switching unit.

Although the handset 4 is provided with the out-of-service indicator 46 to visually inform the user whether or not a call can be made, the handset 4 may be notified by voice.
In addition, base unit 3 can also detect whether or not the mobile phone is out of service area.

G. Effects of the Invention As described above, according to the present invention, when the determination as to whether the service area of the car telephone is in the service area or out of the service area is switched from the in-vehicle telephone body to the handset, the in-area signal or the out-of-area signal is wirelessly transmitted only for a certain time. The handset switches between the in-range / out-of-range display when the in-range or out-of-range signal is received from the in-vehicle phone body. Then, convenience is improved. Further, the wireless channel is hardly occupied in a short transmission time, and does not affect outgoing and incoming calls.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a circuit block diagram of a mobile device main body and a parent device, FIG. 2 is a circuit block diagram of a handset, and FIG. ,
FIG. 4 is a flowchart of a handset, FIG. 5 is a diagram showing a relationship between an out-of-service display control signal and a display operation, and FIG. 6 is a block diagram of a mobile radio. 2: Mobile unit itself, 3: Master unit 4: Handset, 25, 35, 45: Control unit 46: Out of service indicator

Claims (1)

(57) [Claims] An automobile telephone, comprising: an in-vehicle telephone body for performing wireless communication with a base station; and a handset for performing wireless communication with the in-vehicle telephone body, wherein the handset relays the in-vehicle telephone body to communicate with the base station. In the apparatus, the in-vehicle telephone body includes a determination unit that determines whether the service area of the mobile phone is outside the service area, and a transmission unit that transmits an in-service signal or an out-of-service signal for a predetermined time when the determination of the determination means is switched. A handset, receiving means for receiving an in-service signal and out-of-service signal, display means for displaying whether the service area of the car phone is in or out of service, and display means in response to reception of the in-service signal or out-of-service signal by the receiving means. Switching means for switching between in-service and out-of-service displays.