JPH07298350A - Portable telephone system - Google Patents

Abstract

PURPOSE:To obtain the portable telephone system having a place missing preventing function which can easily specify the place where a user carrying a monitored-side terminal is. CONSTITUTION:This system has a monitoring-side PHP terminal 2 and the monitored-side PHP terminal 3 which can make a mutual direct communication, and the monitoring-side PHP terminal 2 calculates a reception level predicted value R by a reception level predicted value calculating means 201 from a monitor distance (x) inputted as a monitor area for the monitored-side PHP terminal 3. Then when it is judged that the link with the monitored-side PHP terminal 3 is set, the current reception level R2 is compared by a reception level comparing means 102 with a previously calculated reception level predicted value R and a judging means 103 judges the comparison result to judge whether or not the monitored-side PHP terminal 3 is within a range of the monitor distance (x).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone system having a lost child prevention function.

[0002]

2. Description of the Related Art Recently, many time-division multiplex type mobile phones have been used which allow the call to be made by calling the other party from the outdoors. Such mobile phones are practically used as PHP (Personal Handy Phone). It is considered that the monitoring-side PHP will be further popularized in the future, as an example of its usage, by utilizing the feature that the PHP terminals can directly talk with each other.
It is also considered that the PHP terminal, which is the monitored side of the terminal, is used to prevent the child from getting lost.

[0003]

However, in the conventional mobile phone systems, the monitoring side PHP terminal calls the monitored side PHP terminal by the call function between the PHP terminals and the surrounding state from the monitored side. It is like waiting for a report to confirm whereabouts, so if the owner of the monitored side is someone who can not explain the surrounding situation accurately, such as a child or an elderly person, the monitoring PHP For the terminal, there is a problem that the location of the other party cannot be easily specified.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a mobile phone system having a lost child prevention function capable of easily specifying the whereabouts of an owner of a monitored terminal. .

[0005]

According to the present invention, in a portable telephone system having at least two telephone terminals and enabling a direct call between these telephone terminals, one telephone terminal is monitored. A terminal, the other telephone terminal as a monitored terminal, the monitoring terminal, a reception level prediction value calculating means for calculating a reception level prediction value from a monitoring distance corresponding to the monitoring area given to the monitored terminal. A link establishment determination means for determining link establishment with the monitored terminal, a reception level at the time when the link establishment determination means determines link establishment, and a predicted value of the reception level obtained by the reception level predicted value calculation means. And a judging means for judging whether or not the monitored terminal is in the monitoring area based on the comparison result of the comparing means.

Further, according to the present invention, in a portable telephone system having at least two telephone terminals and enabling direct communication between these telephone terminals, one telephone terminal is a monitoring side terminal and the other is a monitoring side terminal. The telephone terminal as the monitored terminal,
The monitoring side terminal calculates a reception level prediction value from a monitoring distance corresponding to a monitoring area given to the monitored terminal, and a reception level prediction value calculating means, and a ringback tone during communication with the monitored terminal. Means for stopping the output, a link establishment determining means for determining link establishment with the monitored terminal, a reception level at the time when the link establishment is determined by the link establishment determining means, and the reception level predicted value calculating means. Comprising a comparing means for comparing the obtained predicted value of the reception level, and a judging means for judging whether the monitored terminal is in the monitoring area based on the comparison result of the comparing means. It is configured to include means for stopping the output of the ringer tone when an incoming call is received from the monitoring side terminal.

[0007]

As a result, according to the present invention, in a mobile telephone system that enables direct communication between at least two telephone terminals, one telephone terminal is a monitoring side terminal and the other telephone terminal is a telephone terminal. In the case of the monitoring side terminal, the monitoring side terminal calculates the reception level prediction value in advance by the reception level prediction value calculation means from the monitoring distance corresponding to the monitoring area given to the monitored side terminal, When the link establishment is judged by the link establishment judging means, the receiving level at the time of judging the link establishment is compared with the predicted value of the receiving level obtained by the receiving level predicted value calculating means by the comparing means, and the monitored result is obtained from the comparison result. Since it is determined whether the terminal on the monitoring side is in the monitoring area, whether the terminal owning the monitored terminal is in the preset monitoring area for those who own the monitored terminal Whether it is possible to know to always accurate.

Further, according to the present invention, the terminal on the monitoring side stops outputting the ringback tone during communication with the terminal on the monitored side, and the terminal on the monitored side receives the ringer tone upon receiving the call from the terminal on the monitoring side. Since the output is stopped, it is possible to eliminate a wasteful operation of unnecessarily responding to the other party during the operation of the lost child prevention function.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of the mobile phone system of the embodiment. Reference numeral 1 is a base station to which a plurality (two in the illustrated example) of PHP terminals 2 and 3 can be wirelessly connected. Further, the PHP terminals 2 and 3 enable communication between the terminals.
The terminal 2 is the monitoring side and the PHP terminal 3 is the monitored side.

FIG. 2 shows a schematic configuration of such PHP terminals 2 and 3. In the figure, 11 is an antenna,
A high frequency section 12 is connected to the antenna 11.
The high frequency unit 12 performs frequency conversion processing, and includes an antenna switch unit 121, a receiving unit 122, and a transmitting unit 123.
And a PLL synthesizer 124.

Here, the antenna switch section 121 receives the input signal from the antenna 11 to the receiving section 122 and the transmitting section 1
The output signal from 23 is distributed to the antenna 11. The reception unit 122 receives the reception signal input from the antenna 11 via the antenna switch unit 121.
For example, frequency conversion is performed by a two-stage mixer, and 1.9 GH
z from 150 to 250 MHz, further 10 MHz IF
I am trying to generate a signal. The transmitting unit 123 frequency-converts a modulated wave of π / 4 shift QPSK input from the modem 13 described later with a mixer to 1.9 GHz, and outputs it to the antenna 11 via the antenna switch unit 121. And the PLL synthesizer 12
4 is for performing local oscillation for frequency conversion in the receiving unit 122 and the transmitting unit 123.

Then, the high frequency section 12 has a modem 13,
TDMA14, speech codec 15 and PCM
16, a speaker 18 on the receiving side and a microphone 19 on the transmitting side are connected to the PCM 16 via an amplifier 17.

Here, the modem 13 uses a π / 4 shift QP
It performs SK modulation and demodulation processing, and at the receiving side, the receiving unit 1
The IF signal from 22 is demodulated and separated into IQ data,
The data is transferred to the TDMA 14 as a data string, and on the transmission side, IQ data is created from the data transferred from the TDMA 14, and π / 4 shift QPSK modulation is performed, and the IQ data is sent to the transmission unit 123.

The TDMA 14 performs frame synchronization and slot format processing. On the receiving side, a slot is taken out from the data (frame) sent from the modem 13 at a predetermined timing, descrambled, and the like. The configuration data is taken out from the above format, the control data is sent to the control unit 20 which will be described later, the voice data is transferred to the speech codec 15, and the transmitting side sends the control data to the voice data transferred from the speech codec 15. A slot is added to create a slot, scrambled, inserted into a frame at a predetermined timing, and transferred to the modem 13.

The speech codec 15 performs compression / expansion processing of digital data.
ADPCM audio signal (4bi) sent from MA14
t × 8 KHz = 32 Kbps for PCM audio signal (8 b
(it × 8 KHz = 64 Kbps), it is expanded by decoding and output to PCM16.
The PCM voice signal sent from the D.6 is compressed by being encoded into the ADPCM voice signal and sent to the TDMA 14.

The PCM 16 performs analog / digital processing. On the receiving side, the PCM audio signal sent from the speech codec 15 is D / A converted to output an analog signal to the amplifier 17 to drive the speaker 18. Also, on the transmitting side, the analog voice signal input from the microphone 19 is A / D converted and the PCM voice signal is output to the speech codec 15. In addition, this PCM16, volume, ringer,
It also controls tone signals.

The high frequency section 12 and the modem 1
3, TDMA14, speech codec 15 and P
A control unit 20 is connected to the CM 16 and the control unit 20
ROM 21, RAM 22, recording / reproducing circuit 23, memory 2
4, the key input unit 25 and the display unit 26 are connected.

Here, the control unit 20 outputs a control command to each circuit according to the control program stored in the ROM 21, and here, the reception level predicted value calculation unit 201, the reception level comparison unit 102, and the determination unit. It has 103.

The reception level predictive value calculating means 201 calculates the current reception level R1 and the monitoring distance x of the monitored PHP terminal 3.
From this, the reception level predicted value R is calculated. Also,
The reception level comparison means 102 compares the reception level R2 at the time when the link is established with the monitored PHP terminal 3 and the reception level predicted value R. Then, the determination means 10
3 determines whether or not the monitored PHP terminal 3 is within the range of the monitoring distance x based on the comparison result of the reception level comparing means 102.

The RAM 22 temporarily stores the data handled by the control of the control unit 20. Recording-play circuit 2
3 is for recording and reproducing a message when used as an answering machine. The memory 24 stores a standard message when used as an answering machine.

The key input section 25 is adapted to give a key input for setting each function to the control section 20. The display unit 26 displays input data and results for various controls.

Next, the operation of the embodiment configured as described above will be described. In this case, in the mobile phone system shown in FIG. 1, the PHP terminals 2 and 3 can communicate with each other. Here, the PHP terminal 2 is used as a monitoring side and the PHP terminal 3 is used as a monitored side. The case will be described.

First, in the monitoring-side PHP terminal 2, when the key input section 25 is used to instruct the lost child prevention function, the flowchart shown in FIG. 3 is executed. In this case, step 301
Then, the monitoring distance x is input from the key input unit 25 as a monitoring area for the monitored PHP terminal 3. The monitoring distance x in this case is set to a size sufficiently including the whereabouts of the monitored PHP terminal 3 as shown in FIG.

Next, in step 302, the reception level prediction value calculation means 201 of the control unit 20 calculates the reception level prediction value at the monitoring distance x. In this case, the reception level predicted value R is calculated by the following formula from the current reception level R1 and the monitoring distance x.

[0025]

[Equation 1]

Then, the reception level predicted value calculating means 2
The reception level predicted value R obtained by the calculation of 01 is stored in the RAM 2
Store in 2. Next, in step 303, the monitored PHP
The connection operation with the terminal 3 is executed, and in step 304, the control unit 20 stops the output of the ringback tone (RBT) during the communication with the monitored PHP terminal 3.

Next, in step 305, the monitored PHP is
It is determined whether the link with the terminal 3 has been established. Here, if the link is not established and the result is NO, in step 306, the display unit 26 immediately displays that communication is impossible. On the other hand, if the link is established and YES is determined, it is determined in step 307 whether the monitored PHP terminal 3 is in the monitoring area.

In this case, the reception level comparing means 102 of the control unit 20 compares the reception level R2 at the time point when the link establishment with the monitored PHP terminal 3 succeeds with the reception level predicted value R calculated in advance.

Then, the judging means 103 judges the comparison result of the reception level comparing means 102. Where R ≧ R2
If so, the monitored PHP terminal 3 is outside the range of the monitoring distance x, that is, outside the monitoring area.
Then, in step 308, a message indicating that the monitored PHP terminal 3 has moved out of the monitoring area is immediately displayed on the display unit 26. On the other hand, if R <R2, the monitored PHP
Since the terminal 3 is within the range of the monitoring distance x, that is, within the monitoring area, it is determined to be YES.

Then, the process proceeds to step 309 to judge the elapsed time of the call with the monitored PHP terminal 3. here,
If the call time is within a predetermined time (in the case of a PHP terminal, the call between the terminals is determined within 3 minutes), NO.
Then, the procedure returns to step 305, and then step 30
The operations after 5 are repeated. That is, if the call time with the monitored PHP terminal 3 is within a predetermined time, the monitored terminal P is always
It becomes possible to monitor whether or not the monitored PHP terminal 3 is in the monitoring area while determining the link state between the HP terminals 3.

After that, if it is determined YES in step 309 after the call time has passed a predetermined time, step 310
Shuts off the link with the monitored PHP terminal 3 for 2 seconds. Then, returning to step 303, the monitored PH
The connection operation with the P terminal 3 is executed, and the following step 303
The subsequent operations will be repeated.

On the other hand, in the monitored PHP terminal 3 as well, when the key input section 25 is used to instruct the lost child prevention function, the flowchart shown in FIG. 4 is executed. In this case, FIG.
Corresponding to the connection operation of the monitored PHP terminal 2 to the monitored PHP terminal 3 in step 303 shown in FIG.
At 1, the connection operation with the monitoring PHP terminal 2 is executed.

Next, in step 402, the control unit 20 causes the ringer tone (R
The output of T) is stopped. Next, in step 403, it is determined whether the link with the monitoring PHP terminal 2 has been established.

Here, when the link is not established and the result is NO,
Immediately in step 404, the display 26 indicates that communication is impossible. On the other hand, when the link is established and YES is determined, the process proceeds to step 405, and the elapsed time of the call with the monitoring PHP terminal 2 is determined. Here, if the call time is within the predetermined time (also within 3 minutes in this case), NO is determined and step 4 is performed.
Returning to step 03, the operation after step 403 is repeated. That is, if the call time with the monitoring-side PHP terminal 2 is within a predetermined time, the elapsed time of the call is monitored while always determining the link state between the monitoring-side PHP terminal 2.

After that, if it is determined YES in step 405 after the call time has passed a predetermined time, step 406
The link with the monitoring PHP terminal 2 is cut off for 2 seconds. Then, returning to step 401, the monitoring-side PH is restarted.
Corresponding to the connection operation with the monitored PHP terminal 3 at the P terminal 2, the connection operation with the monitored PHP terminal 2 is executed, and thereafter, the operations from step 401 onward are repeated.

Therefore, in this way, in the monitoring PHP terminal 2, the reception level prediction value R is calculated by the reception level prediction value calculating means 201 from the monitoring distance x input as the monitoring area for the monitored PHP terminal 3. When the establishment of the link with the monitored PHP terminal 3 is judged, the reception level R2 at this time is compared with the reception level predicted value R calculated in advance by the reception level comparing means 102, and the comparison result is obtained. By the judgment by the judgment means 103, the monitored PH
Since it is possible to determine whether or not the P terminal 3 is within the range of the monitoring distance x, that is, in the monitoring area, for example, the monitoring-side PHP terminal 2 is owned by the parent, and the monitored-side PHP terminal 3
If the child is owned by the child, the parent can always monitor whether the child is in the surveillance area set to an arbitrary surveillance distance, and by allowing the child's behavior in the surveillance area, the child can be monitored. It will be possible to reliably prevent the child from getting lost.

Further, in the monitoring-side PHP terminal 2, when the connection operation with the monitored-side PHP terminal 3 is executed, the output of the ringback tone (RBT) during the communication with the monitored-side PHP terminal 3 is stopped. , The monitored PHP terminal 3 also has a monitoring side P
Since the output of the ringer tone (RT) from the HP terminal 2 at the time of an incoming call is stopped, it is possible to eliminate a wasteful operation of unnecessarily responding to the other party during the operation of the lost child prevention function.

The present invention is not limited to the above-mentioned embodiments, but can be carried out by appropriately modifying it without departing from the scope of the invention.
For example, although the reception level prediction value R is calculated from the monitoring distance x in the present embodiment, the reception level prediction value R is not limited to this, and the reception level prediction value R is referred to by referring to the table storing the reception level prediction value R corresponding to the monitoring distance x. May be obtained. As a result, the reception level prediction value can be easily obtained without the need for calculation by the CPU.

Further, in the present embodiment, the display (display may be made by voice) is made according to the change in the inside or outside of the monitoring distance, but the distance is calculated from the reception level of the radio wave from the monitored terminal which is constantly detected. You may make it notify by performing (inverse calculation from the above formula). At this time, the distance may be obtained from the table. By doing so, the approximate distance to the monitoring terminal can be recognized, and the anxiety of the monitoring person can be reduced.

[0040]

As described above, according to the present invention, in a portable telephone system that enables direct communication between at least two telephone terminals, one telephone terminal is a monitoring side terminal and the other telephone terminal is a monitoring side terminal. When the telephone terminal is the monitored terminal, the monitoring terminal calculates the reception level prediction value in advance by the reception level prediction value calculation means from the monitoring distance corresponding to the monitoring area given to the monitoring target terminal, When the link establishment determination means determines the link establishment with the side terminal, the comparison means compares the reception level at the time when the link establishment is determined with the reception level predicted value obtained by the reception level predicted value calculation means, and this comparison is made. Since it is determined from the result whether or not the monitored terminal is in the monitoring area, the owner of the monitored terminal may have a preset monitoring error for the owner of the monitored terminal. Whether the owner of the monitored terminal gets lost by allowing the behavior of the owner of the monitored terminal only within the monitoring area Can be reliably prevented.

Further, according to the present invention, the terminal on the monitor side stops outputting the ringback tone during communication with the terminal on the monitor side, and the terminal on the monitor side receives the ringer tone upon receiving the call from the terminal on the monitor side. Since the output is stopped, it is possible to eliminate a wasteful operation of unnecessarily responding to the other party during the operation of the lost child prevention function.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a PHP terminal used in one embodiment.

FIG. 3 is a flowchart for explaining an operation of the monitoring-side PHP terminal of the embodiment.

FIG. 4 is a flowchart for explaining the operation of the monitored PHP terminal of one embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base station, 2 ... Monitor side PHP terminal, 3 ... Monitored side PHP terminal, 11 ... Antenna, 12 ... High frequency part, 121 ... Antenna switch part, 122 ... Receiving part, 123 ... Transmitting part, 124 ... PLL synthesizer, 13 ... Modem, 14 ... TDMA, 15 ... Speech codec, 16 ... PCM, 17 ... Amplifier, 18 ... Receiver side speaker, 19 ... Microphone, 20 ... Control section, 21 ... ROM, 22 ... RAM, 23 ... Recording / reproducing circuit, 24 ... Memory, 25 ... Key input section, 26 ... Display section.

Claims (2)

[Claims] 1. In a mobile phone system having at least two telephone terminals and enabling a direct call between these telephone terminals, one telephone terminal is a monitoring side terminal and the other telephone terminal is a monitored side. As a terminal, the monitoring side terminal determines reception level prediction means for obtaining a reception level prediction value from a monitoring distance corresponding to a monitoring area given to the monitored side terminal, and determines link establishment with the monitored side terminal. Link establishment determining means, comparing means for comparing the reception level at the time when the link establishment is determined by the link establishment determining means with the predicted value of the reception level obtained by the reception level predicting means, and the comparison result of the comparing means A mobile phone system having a lost child prevention function, comprising: a determination unit that determines whether the monitored terminal is in the monitoring area. 2. In a mobile phone system having at least two telephone terminals and enabling direct communication between these telephone terminals, one telephone terminal is a monitoring side terminal and the other telephone terminal is a monitored side. As a terminal, the monitoring side terminal is a reception level predicting means for obtaining a reception level prediction value from a monitoring distance corresponding to a monitoring area given to the monitored side terminal, and a ring back tone during communication with the monitored side terminal. Means for stopping the output of, the link establishment determining means for determining the link establishment with the monitored terminal, the reception level at the time when the link establishment determining means determines the link establishment, and the reception level predicting means. Comparing means for comparing the predicted value of the reception level, and judging means for judging whether or not the monitored terminal is in the monitoring area from the comparison result of the comparing means, Serial monitored terminal can be a cellular telephone system having a stray prevention function, characterized by comprising a means for stopping the output of Ringaton during incoming call from the monitoring terminal.