JP3293604B2 - Wireless communication terminal and wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication terminal capable of receiving radio waves transmitted from a base station and extracting a system time from the received radio waves, and a radio communication system including the radio communication terminals. .

[0002]

A portable telephone terminal, which is one of the wireless communication terminals, generally has a clock function, and is configured to be able to display the date and time on a display. As a configuration for realizing the clock function, there has conventionally been a real-time clock (RTC) which is a clock IC. The real-time clock counts the number of clock pulses output from the oscillator, generates a unit time signal indicating a unit time on condition that the counted value reaches a reference value, and generates the generated unit time signal. Is configured to generate the terminal time based on the That is, assuming that the frequency at which the oscillator oscillates is, for example, 32.768 KHz, by setting the reference value to “32768”, a unit time signal indicating 1 second as a unit time is generated, and the terminal time is set in seconds. Can be generated.

[0003] Actually, there is an individual difference between the oscillators, and there is an oscillator whose oscillation frequency is deviated from 32.768 KHz. Therefore, the oscillation frequency is 32.76.
With a real-time clock that inputs a clock pulse that deviates from 8 kHz, after a certain amount of time has passed,
There is a problem that the accuracy of the terminal time is reduced due to the oscillation frequency being shifted from 32.768 KHz.

In order to solve the above problem, Japanese Patent Laid-Open No. 9-197070 discloses a method of receiving a radio wave transmitted by a base station, extracting a system time from the received radio wave, and setting a terminal time to a system time. Is disclosed. According to this, since the system time is a highly accurate time, it is possible to acquire a highly accurate terminal time by causing the terminal time to follow the highly accurate system time.

[0005] However, since the system requires that the system time be extracted from the received radio waves, it is located outside the area where the portable telephone terminal cannot receive the radio waves or cannot decode the received radio waves. In this case, it is impossible to extract the system time, and it is impossible to improve the accuracy of the terminal time. In other words, there is a problem that the user cannot recognize an accurate time when the user is located outside the service area.

[0006] Not only when the mobile phone terminal is located outside the service area but also when the power of the mobile phone terminal is turned off, in other words, the reception of radio waves is forcibly prohibited. In this case as well, there is a problem that the user cannot recognize an accurate time.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to generate a highly accurate terminal time even when radio waves are not received.
Accordingly, it is an object of the present invention to provide a wireless communication terminal that allows a user to recognize an accurate time and a wireless communication system including the wireless communication terminal.

[0008]

According to the wireless communication terminal of the present invention, the system time extracting means receives the radio wave transmitted by the base station and extracts the system time from the received radio wave. The counting means counts the number of clock pulses output by the oscillating means, and outputs a unit time signal indicating a unit time on condition that the counted value reaches a reference value. Is
The terminal time is generated based on the unit time signal output by the counting means.

The control means stores, at a predetermined time, the system time extracted by the system time extraction means and the terminal time generated by the terminal time generation means, and after a predetermined time has elapsed from the predetermined time, the system time is reset. The elapsed time is compared with the elapsed time of the terminal time, and a correction value that satisfies the condition that both elapsed times match is calculated. Also, the control means may input the time
When the input means inputs the time, input the terminal time
Rewrite to the time input by the means, input by the time input means
Stores the system time and terminal time with the time as the predetermined time
Thereafter, after a predetermined time has elapsed from a predetermined time,
In addition, the elapsed time of the system time, the elapsed time of the terminal time,
And the correction that satisfies the condition that both elapsed times match
Calculate the value. The correction means corrects the reference value in the counting means based on the correction value calculated by the control means.

That is, according to this, the elapsed time of the system time extracted by the system time extracting means and the elapsed time of the terminal time generated by the terminal time generating means are counted based on the correction value satisfying the condition that the same. Since the reference value in the means is corrected, the reference value is corrected based on the elapsed time of the system time, and when the reference value is corrected once in this manner, the counting means: Thereafter, a unit time signal is output using the corrected reference value.

[0011] Therefore, even when the terminal is out of the service area or when the power is turned off and the radio wave is not received, it is possible to generate the terminal time with high accuracy based on the system time. Thereby, the user can recognize the exact time. In this case, it is also possible to eliminate the influence of the individual difference of the oscillation means. When the time input means inputs the time, the terminal time
Is rewritten at the input time.
Can easily rewrite the terminal time. Also,
Since then, the elapsed time of the system time and the elapsed time of the terminal time
Even if there is a deviation between
After a predetermined time has elapsed, the reference value in the counting means
The difference between the elapsed times of the two
Compensated, the user is compensated based on the system time
The exact time can be recognized.

According to the second aspect of the present invention, when the calculated correction value is outside the allowable range, the control means notifies the notifying means of notification information indicating an abnormality. That is, according to this, when the calculated correction value exceeds the allowable range, the notification information indicating the abnormality is notified, so that the user can determine the time between the elapsed time of the system time and the elapsed time of the terminal time. It can be recognized that the deviation is extremely large.

[0013] According to the wireless communication system of the third aspect,
If the wireless communication terminal generates a highly accurate terminal time,
A system that can be used.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a portable telephone terminal which can be used in a code division multiple access (CDMA) wireless communication system will be described below with reference to the drawings. I do.

FIG. 1 is a functional block diagram showing an electric configuration of a portable telephone terminal. Mobile phone terminal 1
, The control circuit 2 (control means in the present invention) includes a radio circuit 3 (system time extracting means in the present invention), a voice input / output circuit 4, a key operation identification circuit 5, a display control circuit 6, and an LED control circuit 7. And the respective circuits of the clock circuit 8 are connected.

The radio circuit 3 is connected to the antenna 9 and executes radio processing related to radio communication with the base station 10. When receiving the radio wave transmitted by the base station 10, the wireless circuit 3 extracts the system time from the received radio wave and outputs the extracted system time to the control circuit 2.
Note that in a code division multiple access wireless communication system, the system time is a highly accurate time.

The voice input / output circuit 4 includes a microphone 11 for inputting transmitted voice and a receiver 1 for outputting received voice.
2 is connected, and performs audio processing related to wireless communication. The key operation identification circuit 5 includes a keypad 13 in which various keys such as a call start key, a redial key, a call end / power key, and numeric keys “0” to “9” are arranged.
(Time input means in the present invention) is connected, and when a key operation on the keypad 13 is detected, a key operation signal is output to the control circuit 2. Is input, the input key operation signal is decoded.

The display control circuit 6 is connected to a display 14 (notifying means in the present invention). When a display command is input from the control circuit 2, display information corresponding to the input display command is displayed on the display 14. Let it. L
The ED control circuit 7 is connected to the LED 15, and when a blink command is input from the control circuit 2, the ED control circuit 7 causes the LED 15 to blink according to the input blink command.

The clock circuit 8 includes a counter 16 (counting means in the present invention), a clock counter 17 (terminal time generating means in the present invention), and a correction counter 18 (correcting means in the present invention). The counter 16 includes the oscillator 1
9 counts the number of clock pulses output,
When the counted value reaches the reference value, a unit time signal indicating the unit time is output to the clock counter 17.

When a unit time signal is input from the counter 16, the clock counter 17 generates a terminal time based on the input unit time signal, and outputs the terminal time to the control circuit 2. Then, when the terminal time is input from the clock counter 17, the control circuit 2 outputs a display command to the display control circuit 6 to display the input terminal time on the display 14.

With such a configuration, the frequency at which the oscillator 19 oscillates is an ideal value, for example, 32.768 KH.
Assuming that it is z, by setting the reference value to “32768”, it is possible to generate a unit time signal indicating 1 second as a unit time, and to display the terminal time on the display 14 in seconds.

At a predetermined time, the control circuit 2
When the system time is input from the wireless circuit 3 and the terminal time is input from the clock counter 17 of the clock circuit 8, the input system time and terminal time are stored. When a predetermined time has elapsed from the predetermined time, the control circuit 2 compares the elapsed time of the system time with the elapsed time of the terminal time, calculates a correction value according to the comparison result, and outputs the calculated correction value to a clock circuit. 8 to the correction counter 18.

When a correction value is input from the control circuit 2 and a correction command is input from the clock counter 17, the correction counter 18 corrects a reference value in the counter 16 based on the correction value input from the control circuit 2.

The control circuit 2 includes a key operation identification circuit 5
When the operation of the key for turning on the power is detected by decoding the key operation signal input from the CPU, the system time setting command is output to the clock counter 17 of the clock circuit 8, and the clock counter 17 When a system time setting command is input from the control circuit 2, the terminal time is rewritten to the system time. The clock counter 17 rewrites the terminal time to the system time not only when the system time setting command is input from the control circuit 2 but also when the terminal time generated by the clock counter 17 reaches the set time. .

Further, the control circuit 2 decodes the key operation signal input from the key operation identification circuit 5 to detect that the user has operated a key for setting the time, and when the user operates the key input signal, the user inputs the time. Set command to clock circuit 8
When a user input time setting command is input from the control circuit 2, the clock counter 17 rewrites the terminal time to the time input by the user.

Next, the operation of the above configuration will be described with reference to FIG.
5 will be described with reference to FIG. FIG. 2 is a flowchart illustrating a process executed by the control circuit 2 when the system time is input from the wireless circuit 3 in the mobile phone 1. First, when the system time is input from the wireless circuit 3, the control circuit 2 determines whether a correction value has been calculated in the past (step S1).

Here, assuming that the control circuit 2 has not calculated the correction value in the past, the control circuit 2 proceeds to step S1.
Is determined to be “NO”, and it is determined whether or not the reference time (the predetermined time in the present invention) is stored (Step S
2).

Now, the reference time will be described with reference to FIGS.
This will be described with reference to FIG. The reference time is a time used as a criterion for determining whether or not the control circuit 2 executes a correction process described later.
The correction process is executed on condition that two hours have elapsed. Then, the control circuit 2 stores the reference time according to any one of the following three methods (1) to (3).

(1) The system time at the time when the power is turned on is stored as a reference time. (2) The system time at the time when the terminal time generated by the clock counter 17 reaches the set time is stored as the reference time. (3) The system time at the time when the user inputs the time is stored as the reference time. Hereinafter, these three methods will be sequentially described.

(1) When the system time at the time when the power is turned on is stored as the reference time. In this case, as shown in FIG. The system time (Ta) is stored as a reference time, and a system time setting command is output to the clock counter 17 of the clock circuit 8.
Then, in response to this, upon receiving a system time setting command from the control circuit 2, the clock counter 17 rewrites the terminal time (Ta ') to the system time. Therefore, in this case, the system time matches the terminal time.

(2) When the system time at the time when the terminal time generated by the clock counter 17 has reached the set time is stored as the reference time. In this case, the control circuit 2 controls the clock counter 17 as shown in FIG. Generates a set time (for example, 0:00)
0 minutes), the system time (Ta) at the time when the terminal time reaches the set time is stored as a reference time,
Also in this case, a system time setting command is output to the clock counter 17 of the clock circuit 8. Then, in response to this, upon receiving a system time setting command from the control circuit 2, the clock counter 17 rewrites the terminal time (Ta ') to the system time. Therefore, also in this case, the system time matches the terminal time.

(3) When the system time at the time when the user inputs the time is stored as the reference time. In this case, as shown in FIG. 4, when the user inputs an arbitrary time, the control circuit 2 sets the time. The system time (Ta) at the time of input is stored as a reference time, and a user input time setting command is output to the clock counter 17 of the clock circuit 8. Then, in response to this, upon receiving a user input time setting command from the control circuit 2, the clock counter 17 rewrites the terminal time (Ta ') to the time input by the user. Therefore, in this case, the system time does not always match the terminal time. As described above, the control circuit 2 stores the reference time.

Next, assuming that the control circuit 2 stores the reference time, the control circuit 2 determines "YES" in step S2, and determines whether or not a predetermined time has elapsed since the reference time was stored. (Step S
3).

Then, assuming that the predetermined time has elapsed from the time when the reference time is stored by identifying the system time, the control circuit 2 determines "YES" in step S3, and determines whether the system time has elapsed. The time is compared with the elapsed time of the terminal time, and a correction value is calculated according to the comparison result (step S4).

Now, the correction value will be described.
The actual frequency at which the oscillator 19 oscillates is represented by f1,
F2 is the ideal frequency (32.768 kHz) at which oscillation occurs.
If the system time when a predetermined time has elapsed from the reference time is Tb, and the terminal time when the predetermined time has elapsed from the reference time is Tb ', f1, f2, Ta, Ta', T
The relationship between b and Tb 'is

(Equation 1)

Can be expressed as follows. Therefore, f1
Is

(Equation 2)

Can be expressed as

Assuming that the correction value is α, the relationship between α, f1 and f2 is determined by the correction counter 18 as (1)
If f1> f2

(Equation 3)

The above equation (2) is substituted into the above equation.

(Equation 4)

Can be expressed as On the other hand, (2) f1 <
For f2

(Equation 5)

By substituting the above equation (2) into this,

(Equation 6)

Can be expressed as

Here, f2, which is the ideal frequency at which the oscillator 19 oscillates, is

(Equation 7)

Therefore, the control circuit 2 executes the correction processing when the system time (Ta) and the terminal time (Ta ') at the time when the reference time is stored, and when the predetermined time has elapsed from the reference time. System time (Tb
) And terminal time (Tb '),
The correction value can be calculated according to the above equation (4) or (6).

Next, the control circuit 2 determines whether or not the correction value calculated in this way exceeds an allowable range (step S5). Here, if the calculated correction value does not exceed the allowable range, the control circuit 2 determines “NO” in step S5, and outputs the calculated correction value to the correction counter 18 of the clock circuit 8. Then, the correction counter 1
When the correction value is input from the control circuit 2 and a correction command is input from the clock counter 17, the reference value 8 corrects the reference value in the counter 16 based on the correction value input from the control circuit 2 (step S6). Then, the control circuit 2 clears (erases) the corrected result and clears (erases) the reference time (step S7).

On the other hand, if the calculated correction value exceeds the allowable range, the control circuit 2 determines "YES" in step S5, and sets the preset limit value to the correction counter of the clock circuit 8. 18 is output. When the limit value is input from the control circuit 2 and the correction command is input from the clock counter 17, the correction counter 18 corrects the reference value in the counter 16 based on the limit value input from the control circuit 2 (step S8).

In this case, the control circuit 2 outputs a display command to the display control circuit 6 so that an abnormal message indicating that the oscillator 19 is abnormal is displayed on the display 14 as shown in FIG. It is displayed (step S9). Then, the control circuit 2 also clears the corrected result and the reference time in this case (step S7).

It should be noted that the control circuit 2 has the above-mentioned (1) to
Assuming that the process of (3) is not executed and the reference time is not stored, “NO” is determined in the step S2.
Is determined, the system time and the terminal time at that time are identified, and the system time at that time is stored as a reference time (step S10).

As described above, according to this embodiment, in the portable telephone terminal 1, the elapsed time of the system time extracted by the wireless circuit 3 and the elapsed time of the terminal time generated by the clock counter 17 of the clock circuit 8 match. A correction value that satisfies the condition is calculated, and the reference value in the counter 16 is corrected based on the calculated correction value. Therefore, once the reference value is corrected, the counter 16 is corrected thereafter. The unit time signal is output using the reference value.

Therefore, even when the terminal is out of the service area or when the power is turned off or when no radio wave is received, a highly accurate terminal time based on the system time can be generated. Thereby, the user can recognize the exact time. In this case, it is also possible to eliminate the influence of the individual difference of the oscillator 19.

When the calculated correction value is outside the allowable range, an abnormality message indicating an abnormality is displayed on the display 14, so that the user can check the elapsed time of the system time and the elapsed time of the terminal time. It can be recognized that the deviation from time is extremely large.

Further, since the terminal time is rewritten to the system time when the power is turned on, the user can recognize the accurate time based on the system time. Even if a difference occurs between the elapsed time and the elapsed time of the terminal time, the reference value of the counter 16 is corrected as described above after a predetermined time (for example, 12 hours) has elapsed. So the difference between the elapsed times is corrected,
The user can recognize the correct time corrected based on the system time.

The terminal time is set at a set time (for example, 0:00).
0 minute), the terminal time is rewritten to the system time, so in this case also, the user can recognize the correct time based on the system time,
Further, after that, even if there is a difference between the elapsed time of the system time and the elapsed time of the terminal time, if the predetermined time (for example, 12 hours) elapses, the reference 16 Since the value is configured to be corrected, also in this case, the difference between the elapsed times is corrected, and the user can recognize the correct time corrected based on the system time.

When the user inputs an arbitrary time,
Since the terminal time is configured to be rewritten to the input time, the user can easily rewrite the terminal time, and thereafter, the time between the elapsed time of the system time and the elapsed time of the terminal time is set. Even if a deviation occurs, the reference value of the counter 16 is corrected as described above when a predetermined time (e.g., 12 hours) elapses. The shift is corrected, and the user can recognize the correct time corrected based on the system time.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The wireless communication system is not limited to a code division multiple access system, and any public communication system or business establishment (self-employed) can be used as long as it employs highly accurate system time.
Regardless of the communication system, another communication system may be used.

The wireless communication terminal is not limited to a mobile phone terminal, but can extract the system time from radio waves.
If the terminal time can be generated, PDA (Personal
Other terminals such as a Digital Assistant) terminal may be used.

The notification means is not limited to the configuration employing a display, but may be a configuration employing a receiver and outputting a specific sound signal as the notification information indicating an abnormality. Further, a specific sound signal may be output from the receiver at the same time as displaying the abnormal message on the display. The predetermined time is not limited to 12 hours and may be another time, and the set time is not limited to 0:00 and may be another time.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing control contents.

FIG. 3 is a diagram showing a relationship among a system time, a terminal time, and a reference time.

FIG. 4 is a diagram corresponding to FIG. 3;

FIG. 5 is a diagram showing a display on a display.

[Explanation of symbols]

In the drawings, 1 is a mobile phone terminal (wireless communication terminal), 2 is a control circuit (control means), 3 is a wireless circuit (system time extracting means), 13 is a keypad (time input means), and 14 is a display (notifying means). ), 16 are counters (counting means), 17 is a clock counter (terminal time generating means), 18
Denotes a correction counter (correction means).

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI H04M 1/00 H04B 7/26 109J (58) Investigated field (Int.Cl. ⁷ , DB name) H04B 7/24-7 / 26 113 H04Q 7/00-7/38

Claims (3)

(57) [Claims] 1. A system time extracting means for receiving a radio wave transmitted from a base station and extracting a system time from the received radio wave, counting the number of clock pulses output by an oscillating means, and using the counted value as a reference. A radio unit comprising: a counting unit that outputs a unit time signal indicating a unit time on condition that the value has reached a value; and a terminal time generation unit that generates a terminal time based on the unit time signal output by the counting unit. In the communication terminal, the system time extracted by the system time extraction means at a predetermined time and the terminal time generated by the terminal time generation means are stored, and after a predetermined time has elapsed from the predetermined time, the elapsed time of the system time is stored. A control unit that compares the elapsed time of the terminal time and calculates a correction value that satisfies a condition that both elapsed times match; And correcting means for correcting the reference value in the counting means based on the correction value control means is calculated, and a time input means for inputting a time, said control means, said time input means inputs a time
The terminal time is input by the time input means.
The time input by the time input means.
The system time and the terminal time are stored as a fixed time.
A wireless communication terminal. 2. A notifying means for notifying notification information, wherein the control means notifies the notification means of notification information indicating an abnormality when the calculated correction value exceeds an allowable range. The wireless communication terminal according to claim 1. 3. A base station for transmitting a system time, and the wireless communication terminal according to claim 1 or 2.
A wireless communication system, comprising: