JPH01314442A - Moving body communication device - Google Patents

Abstract

PURPOSE:To announce whether a moving body communication device is in a service area or not to a user by generating an audible tone on the discrimination to whether the moving body communication device is in or out of the service area. CONSTITUTION:In a portable radio 100, when a CPU161 receives a synchronization dislocating signal, which is outputted when the respective synchronization of D, P and A channels can not be obtained in a prescribed control signal to be outputted from a base station, from a control signal processing part 168, an audible tone generating signal is outputted to an audio part control part 169 in order to announce that the radio is out of the service area. Thus, an, audible tone signal is outputted from an audible tone generating part 121 and the audible tone is outputted from a speaker 113 through an output amplifier 115 in order to announce that the radio is out of the service area. The synchronization dislocating signal is outputted when the prescribed synchronization can not be obtained in the D, P and A channels of the prescribed control signal from the base station in case that such a radio telephone set is out of the prescribed service area.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) The second invention is directed to mobile communications such as radio telephone devices and portable radio telephone devices used in moving bodies such as automobiles and people. Regarding equipment.

(Prior Art) Telephone systems have become widespread as a means of transmitting information. Furthermore, in recent years, telephone services have become more diverse, and services that provide mobility to telephones have been implemented. For example, there are wireless telephones that are equipped with telephones in mobile bodies such as transportation vehicles such as automobiles, and portable wireless telephones that can be carried by individuals.

Such wireless telephones can communicate only within the service area of the base station.

Therefore, it is necessary to inform the user whether or not the wireless telephone device is within the service area. Conventionally, a predetermined visual display is provided on the display section provided on the device body to inform the user whether or not the wireless telephone device is within the service area. was being done.

However, in mobile communication devices such as car phones that move at high speed and cannot always attract the user's attention due to driving, etc., there is a device installed in the device itself that detects whether the device is within the service area or not. However, if a predetermined visual display is displayed on the display section, there is a problem that it is difficult for the user to easily check the display.

(Problem to be Solved by the Invention) The above-described mobile communication device has a problem in that it is difficult to easily confirm whether or not the mobile communication device is within the service area.

This invention is intended to solve the above-mentioned problems, and one object is to provide a mobile communication device that can reliably inform the user whether or not the mobile communication device is within a service area. do.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a mobile communication device that transmits and receives 1≦ to and from a base station via a wireless line, based on a signal sent from the base station. a discriminating means for discriminating whether or not the mobile communication device is within the service area of the base station; a sound generating means for generating an audible sound; Controlling the audible sound generating means to generate an audible sound based on the fact that the mobile communication device is determined to be within the service area of the base station or that the mobile communication device is determined to be outside the service area of the base station. It is equipped with a control means to

(Function) In the present invention, the mobile communication device is determined to be within the service area of the base station, or based on the fact that the mobile communication device is determined to be outside the service area of the base station. Since the YF5 ES is generated, it is possible to reliably inform the user whether or not this mobile communication device is within the service area.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating an embodiment in which the present invention is applied to a wireless telephone device for both mobile and car AA types.

The radio telephone device shown in the figure is composed of a portable radio device 100 and a vehicle-mounted section main body 200.

The portable radio device 100 includes an antenna 101 and a changeover switch 1.
02. An audio/control unit that performs overall control of the entire device, consisting of a radio unit 103 that forms a wireless line with a base station (not shown) and transfers signals, a control unit 104, and an audio unit 105. unit 106, an ID ROMI 07 in which the system ID number of the zone corresponding to the location where this device is registered and the telephone number corresponding to the location where this device is registered is connected to the power selector switch 108; A power supply control unit 109 that controls power supply in the portable radio 100, a rechargeable battery 110 that serves as a power source when portable, a connection unit 111 that is connected to the vehicle-mounted unit main body 200, an operation display unit 112, and a device for inputting and outputting audible sounds. The main parts include a speaker 113, a microphone 114, an output amplifier 115, and a human power amplifier 116. The operation display section 112 includes a key section 117 on which a predetermined key is pressed manually, a display section 118 on which a predetermined display is performed, a switch section 119 on which various types of switching are performed, a key section 117, a display section 118, and a switch section 119. It is composed of an operation/display control section 120 that performs control, an i1 audible sound generation section 121 that outputs a predetermined iI audible signal, and a voltage detection circuit 130 that detects the voltage level of a voltage supply path 131.

The output amplifier 115 amplifies an audible sound signal (voice signal) sent from the audio section 105 and the audible sound generation control section 121 of the portable radio device 100 and outputs it from the speaker 113. The human power amplifier 116 amplifies the audible sound signal (speech signal) input from the microphone 114. The amplified signal is input to the audio section 105 of the portable radio device 100.

The operation/display control unit 120 is the audio/control unit 106
It performs overall control on the operation display section 112 based on control signals sent from the key section 117, and also sends control signals input from the key section 117 to the audio/control section 106. The display unit 118 consists of a liquid crystal display with no graphic board and a display driver.
Based on the control of the display control unit 120, the liquid crystal display is driven to perform a predetermined display. The key part 117 is "0" to "9".
” number keys, “*”, “#”, rsNDJ, rsTO
J, rENDJ, rRcLJ, rF CNJrCLRJ
, rEMRJ, rMUTEJ, rT.

It consists of a keypad (not shown) such as NEJ function keys, and when the keypad is pressed, this is recognized by the operation/display control unit 120. The switch unit 119 is provided with a hook switch and an 0N10FF switch (not shown), and the hook switch allows the portable radio device 100 to be
on-hook or off-hook. Note that the hook switch may also be provided on the vehicle-mounted section main body 200. 0N
The 10FF switch is the 0N10F switch of this entire wireless radio device.
F is switched, and the switching signal is controlled by the operation and
It is sent from the display control section 120 to the audio/control section 106.

The entire vehicle-mounted main body 200 is operated by an antenna 201 attached to the vehicle, a booster 202 that amplifies the signal transmitted and received by the antenna 201 to a constant power, a command from the audio/control unit 106 of the portable radio 100, etc. Audio/control unit 2 that performs overall control of
03. A power supply control unit 204 that supplies power from the vehicle battery B to various parts, a connection unit 205 that is connected to the connection unit 111 of the portable radio 100 via the coaxial cable 300, and a speaker for inputting and outputting audible sounds. 206 and microphone 2
07, an output amplifier 208, and an input amplifier 209. The booster 202 includes antenna duplexers 210 and 211, a receiving amplifier 212, and a transmitting amplifier 2.
13, an automatic power control circuit (APC) 214 that controls the transmission level of the transmission amplifier 213.

Next, details of the portable radio device 100 will be explained.

FIG. 2 is a block diagram showing in detail the configuration of the above-mentioned portable radio device 100.

As shown in the figure, the radio section 103 includes a demodulator 131, a modulator 132, a power amplifier 133, a duplexer 134,
It is composed of a synthesizer 135. Demodulator 131
is transmitted through the antenna 101, changeover switch 102, and duplexer 134 on the portable radio device 100 side, or through the antenna 201, booster 202, and
It demodulates the received signal from the base station that is input via the changeover switch 102 and the duplexer 134. Note that this signal includes a control signal, an audible sound signal, and the like. The modulator 132 modulates the audible signal, control signal, etc. output from the audio/control unit 106 to generate a transmission signal. Power amplifier 133 amplifies the transmission signal output from modulator 132. The duplexer 134 is
A received signal manually input via the antenna 101 or 201 is sent to the demodulator 131, and a transmit signal manually input via the modulator 132 and the power amplifier 133 is sent to the antenna 101 or the antenna 201.

The synthesizer 135 is a local oscillator for channel selection, and the frequency to be demodulated by the demodulator 131 and the frequency to be demodulated by the modulator 13
2 specifies the frequency to be modulated.

The audio/control unit 106 includes a CPU 161, an oscillator/
Frequency divider 162, address decoder 163, ROM 164
, RAM 165, radio section control section 166, audio section 1
67, control signal processing section 168, audio section control section 16
9, a digital interface 170, and an interrupt controller 171. In the figure, 107 is the above-mentioned IDROM, 109 is a power supply control section, 121 is an audible sound generation control section, 172 is, for example, an 8-bit data bus, 173 is an address bus, and 174 is a control bus.

The CPU 161 performs overall control of the entire audio/control section 106, and the oscillator/frequency divider 162 controls the entire audio/control section 106.
61, and also divides the frequency of this clock and supplies it to each part as a timing signal. Address decoder 163 outputs predetermined operation signals to each section in response to command signals from CPU 161. ROMI 64
stores various programs necessary for the operation of the CPU 161.

The RAM 165 stores various data during processing by the CPU 161. The wireless unit control unit 166
The wireless unit 103 is controlled based on the command 61. For example, the radio unit control unit 166 instructs the frequency that the synthesizer 135 should specify, the amplification factor that the power amplifier 133 should amplify, the degree of modulation that the modulator 132 should modulate, etc., and outputs from the synthesizer 135 as a measure to prevent malfunction. The output detection signal output from the power amplifier 133 and the output detection signal outputted from the power amplifier 133 are manually detected and sent to the CPU 16.
Tell 1. The audio section 167 converts the control signal out of the received signal demodulated by the demodulator 131 into a control signal processing section]6
Among the received signals, the listening signal =il is sent to the speaker 113 via the output amplifier 115. The audio section 167 also receives a control signal output from the control signal processing section 168 and a control signal outputted from the microphone 114 to the human power amplifier 1.
The audible signal output through 16 is sent to modulator 132 .

Note that the audio section 167 has functions of waveform shaping of the control signal to be sent to the control signal processing section 168 and filtering of the control signal to be sent to the modulator 132.

The control signal processing unit 168 performs bit synchronization and frame synchronization with the control signal output from the audio unit 167, captures control data from the base station included in the control signal, which is a serial signal, as a parallel signal, and Control data as a parallel signal to be sent to the base station is sent to the audio section 167 as a control signal as a serial signal. Here, in the above-mentioned control signal processing section 168, when establishing a predetermined synchronization with a manually input control signal, first, synchronization is established for the D channel from the input predetermined control signal. The D channel includes system information and at least a signal for specifying the P channel band. When the D channel is synchronized, the P channel is synchronized. This P channel contains system information, an incoming call signal, and a signal for specifying the band of the A channel, and when synchronization on the P channel is established, the standby state is enabled. Next, synchronize the A channel. This A channel includes system information and a communication channel designation signal.

The audio section control section 169 performs various controls on the audio section 167. For example, the audio section control section 169
is the switching control that sends the received signal from the audio section 167 to the control signal processing section 168 or the output amplifier 15, or the transmission signal output from the control signal processing section 168 or the input amplifier 116h. Switching control is performed to input either one to the audio section 167.

Digital interface 170 provides an interface between audio/control section 106 and operation display section 112 . The interrupt controller 171 interrupts the CPU 161 in response to interrupt commands from various parts.

Next, the r+J auditory sound generation control section 121 and the power supply control section 109
The configuration will be explained using FIG.

As shown in the figure, the power supply control unit 109
It is connected to the power supply control section 204 on the 00 side via the connection section 205.111, and is also connected to the switching terminal of the power supply changeover switch 108 connected to the rechargeable battery 110 side. Further, the power supply control section 109 is connected to the CPU 161, the audio section control section 169, the control signal processing section 168, and the radio section control section 166 via a power supply line 191.

The power supply line 191 of the power supply control unit 109 includes a switch 1.
92 is provided. The switch 192 is switched between 0N10FF by a switch switching circuit 193.

A timer 194 is connected to the switch changeover circuit 193 so that the timer 194 can perform a changeover operation of the switch changeover circuit 193. Further, the CPU 161 is connected to the switch changeover circuit 193 and the timer 194 via a control line 195.

Further, the CPU 161 is connected to a wireless section control section 166, a control signal processing section 168, and an audio section control section via a control line 196. The audio section 167 is connected to the control signal processing section 168 and the audio section control section 169 via an ini line 197, and the audible sound generation control section 121 is connected to the audio section 167. Audio section 167 and audible sound generation control section 121
A speaker 113 is connected to the output amplifier 115 via an output amplifier 115.

In response to a predetermined control signal output from the base station, the CPU 161 uses the control signal processing unit 168 to
When the control signal processing unit 168 receives an out-of-synchronization signal that is output when the synchronization of channels , Output.

As a result, the i*audible sound generator 121 outputs the 6*audible signal, and the speaker 113 outputs an audible sound to notify that the user is outside the service area via the output amplifier 115. Also, after this, the CPU 161 controls the timer 19.
4 is activated, and the switch 192 is opened by the switch changeover circuit 193. The above-mentioned out-of-synchronization signal is output when the radio telephone device leaves a predetermined service area and the predetermined synchronization cannot be achieved in the D%P, A channel of the predetermined control signal from the base station. . Then, by opening the switch 192 described above, the power of the CPU 161, the wireless section control section 166, the control signal processing section 168, and the audio section control section 169 is turned on.
It becomes FF and enters a battery saving state. At this time, a timer mode flag indicating timer operation indicating this state is set in the RAM 165, and a power supply voltage is supplied to the RAM 165 from a backup battery (not shown). Further, when the timer 194 times out, this signal is output to the switch changeover circuit 193, the switch 192 is closed, and power is supplied to the CPU 161 and each section.

Further, the voltage detection circuit 130 detects the voltage of the power supply path 131, and if the voltage of the power supply path 131 is equal to or higher than a predetermined voltage, the power supply changeover switch 108 is connected to the power supply path 131 and the power control unit 109. At the same time, the selector switch 102 is also driven so that the wireless section 103 and the booster 202 are connected. If the voltage of the power supply path 131 is less than a predetermined voltage, the power changeover switch 108 is driven so that the rechargeable battery 110 and the power supply control unit 109 are connected, and the changeover switch 102 is driven so that the wireless unit 103 and the antenna 101 are connected. drive so that therefore,
When the portable radio device 100 is not connected to the vehicle-mounted section main body 200, the seventh generation source control section 109 is supplied with power from the rechargeable battery 110, and the radio section 103 is connected to the antenna 101.

Next, the operation of the radio telephone device configured as described above will be explained using the state transition diagram shown in FIG. 4.

As shown in the figure, first, when the power of the portable radio device 100 is turned on (including when the power is turned on after the timer 194 has timed up) (ST1), the CPU 161
accesses the RAM 165 and confirms the timer mode (ST2). When it is confirmed that it is not in timer mode,
A /1-do check of each part is performed (ST3). next,
Initialization is performed. At this time, in ST2, initialization is also performed when the power is turned on due to time-up from the timer mode (ST4). In this initialization, the system information of the D channel having the strongest received field strength (R3SI measurement) among the plurality of D channel signals in a predetermined control signal is synchronized in the control signal processing unit 168. The D channel includes a signal specifying the P channel band. When the D channel is synchronized and initialized, the P
Channel synchronization is performed (ST5). This P channel synchronization is determined by the reception field strength being the strongest among multiple P channel signals in a predetermined control signal (RSSI measurement).
P channel synchronization is achieved in control signal processing section 168. The P channel includes system information, an incoming call signal, and a signal specifying the band of the A channel. After this, the A channel is synchronized (ST6). This synchronization of the human channel is determined by the reception field strength being the strongest (R5SIΔ
P1 constant) A channel is synchronized in the control signal processing section 168. The A channel contains system information and a communication channel designation signal.

In this state, the standby mode is set, and the call and digits are enabled. If synchronization is not obtained at Sr1.5, the state transitions to Sr1 and the battery save operation continues. In addition, if synchronization cannot be achieved in Sr1 (out of synchronization), the control signal processing unit 168 sends the CPU
No. 6 is output without synchronization at 161, and as a result, CP
The U161 outputs an audible sound generation signal to the audible sound generation section 121 to inform the audio section control section 169 that it is outside the service area. As a result, the audible sound generator 1
An audible sound signal is output from the speaker 113, and an audible sound is output from the speaker 113 via the output amplification 215 to notify that the user is outside the service area (Sr1). After this, the CPU 161 activates the timer 194 and further opens the switch 192 by the switch changeover circuit 193. As a result, the power to the CPU 161, the wireless section control section 166, the control signal processing section 168, and the audio section control section 169 is turned off (Sr1). After this, when the timer 194 times up, the process returns to STI.

Next, the operation of synchronization detection in each channel will be explained.

FIG. 5 is a flowchart for explaining the operation of D channel synchronization detection.

As shown in the figure, first, the received electric field strength of a plurality of D channels is measured (RSSI al+determined) from a predetermined control signal inputted in the control signal processing unit 168 (
STII). Then, the D channel with the strongest electric field strength is selected (S T 12). Thereafter, the selected D channel is synchronized and establishment of synchronization is detected (ST13).

In this 5T13, if synchronization is not established (out of synchronization), for example, a counter in the CPU 161 is counted up (ST14). Next, it is confirmed whether the counter value of the counter is 5 or more (ST15).

At 5T15, if the counter value is less than 5, the process returns to STI 3 and detection of synchronization establishment is performed. Also,
At 5T15, if the counter value is 5 or more, an out-of-synchronization signal is sent from the control signal processing unit 168 to the CPU 16.
1, thereby causing the CPU 161 to output an audible sound generation signal to notify the audio section control section 169 that it is outside the service area. As a result, a signal is output from the audio section 167, and the audible sound generation control section 1
An audible sound signal is output from 21, and an audible sound is output from speaker 113 via output amplifier 115 to notify that the service area is outside.

After that, the CPU 161 activates the timer 194 of the power supply control section 109, and the switch changeover circuit 19
3 to open the switch 192, and the CPU 161
, the radio section control section 166, the control signal processing section 168, and the audio section control section 169. ;Cut i. Also, 5
At T13, if synchronization is established, the P channel selection operation is performed using No. 5 without specifying the P channel band obtained by the D channel.

Next, the synchronization detection operation in the P channel will be explained.

FIG. 6 is a flowchart for explaining the operation of P channel synchronization detection.

As shown in the figure, first, the received electric field strength of a plurality of P channels is measured (R8SI measurement) from a predetermined control signal input in the control signal processing unit 168 (ST21).
. Then select the OP channel with the strongest electric field strength (S
T22). Thereafter, the selected P channel is synchronized and establishment of synchronization is detected (S723). This 5723
If synchronization is not established (out of synchronization),
For example, a counter in the CPU 161 is counted up (ST24). Next, it is confirmed whether the counter value of the counter is 5 or more (ST25).

At 5T25, if the counter value is less than 5, the process returns to 5T23 and detection of synchronization establishment is performed. Also, 5
At T25, if the counter value is 5 or more,
An out-of-synchronization signal is sent from the control signal processing unit 168 to the CPU 161.
As a result, the CPU 161 outputs an audible sound generation signal to notify the audio section control section 169 that it is outside the service area. As a result, an audible sound signal is output from the audible sound generator 121 and the output amplifier 115
An IIJ sound is output from the speaker 113 to notify that the user is out of the service area. After this, the CPU 161 uses the timer 194 of the power supply control unit 109.
At the same time, the switch switching circuit 193 is operated to open the switch 192, and the power to the CPU 161, the wireless section control section 166, the control signal processing section 168, and the audio section control section 169 is turned off. In addition, at 5T23, if synchronization is established, the A
In response to a signal specifying a channel band, the process moves to a standby operation, which is an A channel selection operation.

Next, the operation of synchronization detection in the A channel will be explained.

FIG. 7 is a flowchart for explaining the operation of A channel synchronization detection.

As shown in the figure, first, the received electric field strength of a plurality of A channels is measured (RSSI A11 constant) from a predetermined control signal inputted in the control signal processing unit 168 (
ST31). Then, the L)A channel with the strongest electric field strength is selected (ST32). Thereafter, the selected A channel is synchronized and establishment of synchronization is detected (ST33). In this step 5T33, if synchronization is not established (out of synchronization), for example, a counter in the CPU 161 is counted up (ST34). Next, it is confirmed whether the counter value of the counter is 5 or more (ST35).

At 5T35, if the counter value is less than 5, the process returns to 5T33 and detection of synchronization establishment is performed. Also, 5
At T35, if the counter value is 5 or more,
An out-of-synchronization signal is sent from the control signal processing unit 168 to the CPU 161.
As a result, the CPU 161 outputs an audible sound generation signal to notify the audio section control section 169 that it is outside the service area. As a result, an audible sound signal is output from the audible sound generator 121 and the output amplifier 115
An audible sound is output from the speaker 113 to notify that the user is out of the service area. Thereafter, the CPU 161 operates the timer 194 of the power supply control section 109, operates the switch changeover circuit 193 to open the switch 192, and turns off the power to the wireless telephone device.

In addition, in 5T33, if synchronization is established, the standby state is set, and it is confirmed whether there is a call or a predecessor (S
T36), if there is an incoming or outgoing call, it will be in incoming/outgoing mode,
Also, if there are no incoming or outgoing calls, the standby mode is set. When in standby mode, the process returns to 5T33 and establishment of synchronization is detected.

Therefore, in this embodiment, when the wireless telephone device moves out of the service area, as described above, it detects the establishment of synchronization of a predetermined channel in the control signal, and if synchronization is not established, it is determined to be out of the service area. This wireless telephone device is JILIt! ! It outputs an audible sound to notify the station that it is out of the service area, and also cuts off the power to the control system, transmission/reception system, and cable input/output system of this radio telephone device, so that the user can be assured that the radio It is possible to notify that the telephone device is outside the service area of the base station, and it is also possible to prevent unnecessary battery consumption.

In the above-described embodiment, when the wireless telephone device is outside the service area of the base station, an audible sound is output to notify the user of this. , it may be configured to output an audible sound to notify the user of this.

Furthermore, in the embodiment described above, it is determined whether or not this wireless phone+i'IJ device is within the service area of the base station when synchronization with a predetermined control signal in the signal from the base station has not been established five or more times. Although it has been determined that the base station is outside the service area, it may be determined that the base station is outside the service area when synchronization with a predetermined control signal is not established once or multiple times.

Furthermore, in each of the embodiments described above, whether or not this wireless telephone device is in the service area of the base station is determined by the base station's service when synchronization with a predetermined control signal in the signal from the base station is not established. Although it is determined that the base station is outside the service area, it may be determined that the base station is outside the service area when the electric field strength of the control signal is set to Al1 and the measured electric field strength is smaller than a predetermined threshold value.

In the above-described embodiment, by making the audible sound generating section 121 provided on the side of the portable radio 100 emit a sound, it is possible to set the zone regardless of whether or not the portable radio 100 is connected to the in-vehicle section main body 200. The sound is generated when the user goes outside or enters the zone, but when connected to the vehicle-mounted unit main body 200, the audible sound generator 221 provided in the vehicle-mounted unit main body 200 generates the sound. You can do it like this.

Furthermore, in the above-described embodiment, the operator is notified by a simple sound, but the audible sound generator 121
It may be configured by a voice synthesis IC, and the fact that the zone is inside or outside the zone is notified by synthesized voice.

Furthermore, in the above-described embodiment, the notification is made based on the timing when the user enters the zone or the timing when the user leaves the zone, but it is also possible to make the notification based on the timing when the operator performs some operation. good.

For example, the following cases can be considered:

(1) When installed in a vehicle, that is, when the vehicle-mounted section main body 200 and the portable radio device 100 are connected, when the operator picks up the handset (portable radio device 100) to make a call, the ringing sound from the handset is emitted. The operator may be informed of the inside and outside of the zone by the presence or absence of the zone, the difference in sound tone, or synthesized voice. In this case, CPU161
detects whether the portable wireless device 100 is connected to the vehicle-mounted section main body 200 based on a signal from the voltage detection circuit 130. If the hook switch 230 is in the connected state, the open/close state of the hook switch 230 is detected, and when the hook switch 230 is in the closed state, that is, the off-hook state, the content of the flag indicating that the hook switch 230 is located within the zone or outside the zone is referred to, for example, the zone is detected. If it is within the zone, the audible sound generator 121 is driven to make a sound, and if it is outside the zone, the operator is notified by making the sound silent.

(2) When making an on-hook call, making a call using voice dialing, or making a call when the mobile wireless F11100 is disconnected from the vehicle-mounted unit main body 200, the operator operates the numeric keypad or predetermined operation keys to make the call. Based on the timing, the spill force is notified by 2°6 or 113. In this case, the CPU 161 detects the presence or absence of an operation in the key part 117. When a key operation is detected, the operator is notified with an audible sound whether the operator is within the zone or outside the zone by referring to the contents of the flag indicating whether the operator is within the zone or outside the zone. .

[Effects of the Invention] As explained above, the mobile communication device of the present invention determines that the mobile communication device is within the service area of the base station, or that the mobile communication device is located within the base station service area. Since the audible sound is generated based on the determination that the mobile communication device is outside the service area of the station, it is possible to reliably inform the user whether or not the mobile communication device is within the service area.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating an embodiment in which the mobile communication device of the present invention is applied to a portable and vehicle-mounted type radio telephone device, and FIG. 2 illustrates details of the portable radio device shown in FIG. 1. 3 is a block diagram for explaining the audible sound generation control section and power supply control section in FIG. 2, and FIG. 4 is a block diagram for explaining the operation of the radio telephone device in FIG. 1. The transition diagrams, FIGS. 5, 6, and TS7 are flowcharts for explaining the synchronization establishment detection operation of each channel in FIG. 4, respectively. 100...Portable radio, 101.201...Antenna, 103...Radio unit, 106...Audio/control unit, 115...Output amplifier, 113...Speaker, 121...Possible Auditory sound generation control unit, 161...CPU
, 167... Audio section, 168... Control signal processing section, 169... Audio section control section. Applicant Toshiba Corporation Patent Attorney Sasa Suyama - Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In a mobile communication device that transmits and receives data to and from a base station via a wireless line, the mobile communication device is located within a service area of the base station based on a signal sent from the base station. an audible sound generating means that generates an audible sound; and a determination result by the determining means that the mobile communication device is within the service area of the base station; or a control means for controlling the audible sound generating means to generate an audible sound based on a determination that the mobile communication device is outside the service area of the base station.