JPH09197070A - Data transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately display time at a mobile station by setting the time at the mobile station by a reference time. SOLUTION: The device is constituted of a base station and a mobile station and the mobile station has a clock 13 for displaying time. In this case, the base station has a reference clock 3, time information outputted from the reference clock is transmitted from the base station to the mobile station, the mobile station has an identification means 11 for extracting time information from the transmission information of the receiving base station, and the time information extracted by the identification means 11 is outputted to a clock 12, thus correcting the time of the clock 13. When the time 13 of the mobile station differs from the time of the reference clock of the base station, the clock 13 is reset by the reference clock 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device such as a digital mobile communication device having a clock function in a mobile station, and more particularly to a device for accurately setting the clock time of the mobile station.

[0002]

2. Description of the Related Art A mobile station for digital mobile communication is built in with a built-in clock and displaying the current date and time in a standby state.

FIG. 11 shows the configuration of a mobile station and a base station having such a function. The transmitter of the base station includes an input terminal 211 for inputting information to be transmitted, a transmission information generator 212 for generating transmission information by adding information necessary for transmission to the information input from the input terminal 211, and a transmission information generator. A frame configurator 213 that configures the output of 212 into a required data string on the wireless line,
A modulator 214 that modulates the output of the frame composer 213, a transmitter 215 that amplifies the output of the modulator 214 to the output power required in the wireless line, and a transmission antenna 216 that efficiently outputs the output of the transmitter. Is equipped with.

Further, the receiving section of the mobile station has a transmitting antenna 21.
6, a receiving antenna 217 connected via a wireless line, a receiver 218 for amplifying the output of the receiving antenna 217, and a receiver 218.
Demodulator 21 for demodulating the data sequence transmitted from the output signal of
9, a transmission information identifier 220 that determines the content of the data transmitted from the output of the demodulator 219, an output end 221 that outputs the transmitted information, and a built-in clock that exists independently of these. It is provided with a 222 and a display device 223 that displays the time measured by the clock 222.

In the base station, when the information to be transmitted is inputted from the input terminal 211, the transmission information generator 212 generates information necessary for transmitting the inputted information, such as information of a destination mobile station and a call signal, Change the input signal to a format that facilitates transmission on a wireless line. The output of the transmission information generator 212 is converted by the frame configurator 213 into a form showing the basic structure of the radio channel as shown in FIG. 10, for example.
The converted data string is modulated by the modulator 214, and the transmitter 2
After being amplified to a predetermined output power value by 15, it is output as a radio wave from the transmitting antenna 216.

The transmitted radio wave reaches the receiving antenna 217 via a wireless line. The received signal is received by the receiver 218.
Is amplified by and is converted into a data string by the demodulator 219. The transmission information discriminator 220 selects the transmitted information from the converted data string and outputs it from the output end 221.

The clock 222 can be set at any time. The time information held by the clock 222 is
It is displayed on the display unit 223.

As described above, the conventional data transmission device can transmit data, and the mobile station can display arbitrary time information.

[0009]

However, in the conventional data transmission apparatus, it is possible to set the clock 222 of the mobile station to any time, in other words, the time information displayed by the display device 223. Does not always display the true time.

The present invention solves these conventional problems, and provides a data transmission apparatus which enables accurate time display in a mobile station by adjusting the clock of the mobile station to a reference time. It is intended to be provided.

[0011]

Therefore, in the data transmission apparatus of the present invention, a reference clock is provided in the base station, the time information output from the reference clock is transmitted to the mobile station, and the time of the clock of the mobile station is transmitted. I am trying to fix.

Therefore, the clock of the mobile station can always output the time information that matches the reference clock of the base station.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a data transmission apparatus comprising a base station and a mobile station, the mobile station having a clock for displaying time,
The base station is provided with a reference clock, the time information output by this reference clock is transmitted from the base station to the mobile station, and the mobile station is provided with identification means for extracting the time information from the received transmission information of the base station. The time information extracted by the means is output to the clock to correct the time of the clock, and when the clock of the mobile station is different from the time of the reference clock of the base station,
It is corrected according to the reference clock.

According to a second aspect of the present invention, the base station is provided with a frame structuring means for structuring the transmission information to be transmitted to the mobile station and the time information output from the reference clock into a necessary data string on the wireless line. The time information to be transmitted is assigned to a specific slot of the wireless channel.

According to a third aspect of the present invention, when the transmission information generating means for generating transmission information and the output data of the transmission information generating means are meaningless to the base station, the output data of the transmission information generating means is sent to the base station. Time information replacing means for replacing the time information of the reference clock is provided, and instead of sending meaningless data such as when there is no mobile station to call, the time information of the reference clock is transmitted.

According to a fourth aspect of the invention, the base station is provided with a correction means for periodically correcting the time information of the reference clock, and the time in the reference clock of the base station is accurately corrected. As a result, the time on the clock of the mobile station becomes accurate.

According to a fifth aspect of the present invention, a switching means for periodically connecting the reference clock to the wired network is provided as the correction means, and the time information of the reference clock is corrected by the time information input from the wired network. The time of the reference clock is corrected based on the time information sent through the wire network.

According to a sixth aspect of the present invention, the correcting means is provided with a receiving means for receiving a time signal, and the time information of the reference clock is corrected by the received time signal. The clock time is corrected.

In a seventh aspect of the present invention, the mobile station is provided with a time information request signal generating means for generating a time information request signal, and the base station identifies the request signal transmitted from the mobile station. The time information of the reference clock is transmitted to the mobile station, and the time information of the reference clock of the base station is transmitted in response to the request from the mobile station.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) As shown in FIG. 1, the data transmission apparatus according to the first embodiment includes a reference clock 3 serving as a time reference in a transmitter of a base station, and a frame structure. The device 4 configures the output of the transmission information generator 2 and the output of the reference clock 3 into a required data string on the wireless line.

Further, the receiving section of the mobile station is provided with a clock 13 whose time can be adjusted based on the time information output from the transmission information discriminator 11. Other configurations are similar to those of the conventional device (see
Same as 1).

In the base station of this apparatus, when information to be transmitted such as voice is inputted from the input terminal 1, the transmission information generator 2
Generates the information necessary for transmitting the input information, such as the information of the destination mobile station and the call signal, and changes the input signal into a format that is easily transmitted on the wireless line. The reference clock 3 holds time information serving as a time reference. The output of the transmission information generator 2 and the output of the reference clock 3 are
The frame configurator 4 converts the basic structure of the wireless channel as shown in FIG. At this time, the reference clock 3
Is assigned to a specific slot of the wireless channel as time information.

The data string converted by the frame configurator 4 is modulated by the modulator 5, then amplified by the transmitter 6 to a predetermined output power value, and then output as a radio wave from the transmission antenna 7.

The transmitted radio wave reaches the receiving antenna 8 via a wireless line. The received signal is amplified by the receiver 9 and converted into a data string by the demodulator 10. The transmission information discriminator 11 selects the transmitted information from the converted data string and outputs it from the output terminal 12. Further, the transmission information identifier 11 extracts time information and notifies the timepiece 13 of it. Clock 13
When the already stored time information is different from the time information notified from the transmission information discriminator 11, the time information is corrected based on the information notified from the transmission information discriminator 11.
The display 14 displays time information held by the clock 13.

As described above, in the data transmission apparatus according to the first embodiment, the information of the reference clock of the base station is periodically transmitted in addition to the transmission of the normal information from the base station to the mobile station. The clock corrects the time based on the information of this reference clock.

(Second Embodiment) When the transmission information from the base station is meaningless information, the data transmission apparatus of the second embodiment transmits time information instead of it. As shown in FIG. 2, this device replaces the transmission information with the time information of the reference clock 23 in the base station when the output data of the transmission information generator 22 does not have meaning to the frame configurator.
The time information replacement unit 24 for outputting to 25 is provided. Other configurations are the same as those of the first embodiment (FIG. 1).

The time information replacer 24 of the base station of this apparatus is
The output data of the transmission information generator 22 is monitored, and when sending meaningless data such as when there is no mobile station to call, the transmission data is replaced with the time information output from the reference clock 23. The output of the time information replacer 24 is converted by the frame composer 25 into a form showing the basic structure of the wireless channel, and then transmitted. The subsequent operation is the same as in the first embodiment.

In this device, instead of sending meaningless data from the base station, the information of the reference clock of the base station is transmitted, and the time of the clock of the mobile station is corrected based on this information.
Therefore, the wireless line can be effectively used.

(Third Embodiment) The data transmission apparatus of the third embodiment periodically corrects the time of the reference clock of the base station with highly accurate time information of the wire network. This device is shown in FIG.
As shown in FIG. 5, an input / output terminal 41 for inputting / outputting information from the wired network to the base station, and a transmission information generator 43 for transmitting transmission information of the wired network
And a switch 42 for selectively switching between the connection for transmitting the time information of the wired network to the reference clock 44.
Other configurations are the same as those of the first embodiment (FIG. 1).

The switching device 42 of this device is usually an input / output terminal.
41 is connected to a transmission information generator 43. At this time, the information to be transmitted input from the wired network through the input / output terminal 41 is
In the transmission information generator 43, the information necessary for transmitting the input information such as the information of the destination mobile station and the call signal is added, or after the information is changed to a format that is easy to transmit on the wireless line, the frame configurator 45 input. Further, the time information of the reference clock 44 is also input to the frame configurator 45, and the transmission information and the time information are transmitted from the base station to the mobile station as in the case of the first embodiment.

Further, the switching device 42 is provided with a reference clock 44 at regular intervals.
And the wired network via the input / output terminal 41. At this time,
The reference clock 44 acquires highly accurate time information from the wired network and corrects its own time information.

As described above, the data transmission apparatus of the third embodiment periodically corrects the time information of the reference clock of the base station with the highly accurate time information obtained from the wire network, and the time information of this reference clock is corrected. Therefore, the time of the clock of the mobile station is corrected. Therefore, the clock of the mobile station is set to the correct time.

(Fourth Embodiment) The data transmission apparatus of the fourth embodiment is the one in which the configuration of correcting the time of the reference clock of the base station with the time information of the wired network is applied to the second embodiment. Yes, as shown in FIG. 4, when the output data of the transmission information generator 63 has no meaning, the transmission information is used as a reference clock.
A time information replacement unit 65 that replaces the time information of 64 is provided. Other configurations are the same as those of the third embodiment (FIG. 3).

In this device, instead of sending meaningless data from the base station, the information of the reference clock of the base station is transmitted, and the time of the clock of the mobile station is corrected based on this information.
Further, the reference clock of the base station is regularly corrected with highly accurate time information obtained from the wired network.

(Fifth Embodiment) The data transmission apparatus of the fifth embodiment receives a time signal and corrects the reference clock of the base station. As shown in FIG. 5, this device includes a receiving antenna 83 for obtaining time information from the outside through a wireless line and a time signal receiver 84 for obtaining time information from an output signal of the receiving antenna 83. Other configurations are the same as those of the first embodiment (FIG. 1).

The base station of this device uses the receiving antenna 83 and the time signal receiver 84 to establish a highly accurate time information stored in another device by a wireless line different from the wireless line used for data transmission. Get the reference clock 85 by this time information
Correct the time information of. Therefore, the clock of the mobile station whose time is corrected by the time information of the reference clock 85 is always set to the correct time.

(Sixth Embodiment) A data transmission apparatus according to the sixth embodiment has a configuration in which a reference signal of a base station is corrected by receiving a time signal and is applied to the second embodiment. As shown in FIG. 6, a time information replacement unit 106 is provided for replacing the transmission information with the time information of the reference clock 105 when the output data of the transmission information generator 102 has no meaning.
Other configurations are the same as those of the fifth embodiment (FIG. 5).

In this device, instead of sending meaningless data from the base station, the information of the reference clock 105 of the base station is transmitted, and the time of the clock 116 of the mobile station is corrected based on this information. Further, the reference clock 105 of the base station is corrected by the highly accurate time information obtained through the wireless line.

(Seventh Embodiment) In a data transmission apparatus of the seventh embodiment, a base station transmits time information based on a request from a mobile station. This device, as shown in FIG.
The base station has an input end 121 for transmitting information, a transmission information generator 123 for adding information necessary for transmission to the input information,
A frame composer 123 that composes the output of the transmission information generator 123 into a required data string on the wireless line, and a frame composer 123.
Of the modulator 124 and a transmitter 125 that amplifies the output of the modulator 124 to the output power required in the wireless line.
And the transmitting / receiving antenna 126 that efficiently outputs the output of the transmitter 125 and receives the radio wave from the mobile station, and the antenna 126
A receiver 127 that amplifies the signal received in, and a demodulator 128 that demodulates the data string received from the output signal of the receiver 127,
A reception signal discriminator 129 that discriminates the content of the data transmitted from the output of the demodulator 128, and a reference clock 130 that serves as a time reference.
And

On the other hand, the mobile station has an antenna 13 for both transmission and reception.
1 and a receiver 132 that amplifies the output of the transmission / reception antenna 131
A demodulator 133 that demodulates the data string transmitted from the output signal of the receiver 132, a transmission information identifier 134 that determines the content of the data transmitted from the output of the demodulator 133, and the output of the transmitted information An end 135 and a clock 136 capable of adjusting the time based on the time information extracted by the transmission information identifier 134,
A display 137 of the clock 136 and a time information request signal generator 138 that generates a signal requesting the base station to transmit time information.
And a modulator 139 that modulates the output signal of the time information request signal generator 138, and a transmitter 140 that amplifies the output of the modulator 139 to the output power required for the wireless line.

In this device, when the mobile station tries to correct the time information of the clock 136, the time information request signal generator 13
8 generates a signal requesting transmission of time information from the base station. This request signal is modulated by the modulator 134 and then transmitted to the base station via the transmitter 140 and the transmission / reception antenna 131.

The base station receiving the request signal at the transmitting / receiving antenna 125 reproduces the data sequence from the signal through the receiver 127 and the demodulator 128, and the received signal discriminator 129 extracts the time information request signal from the signal sequence. Then, the reference clock 130 is notified.

In response to this, the reference clock 130 outputs time information, the transmission information generator 122 shapes this in the form of a response message to the mobile station, and the formed time information is transmitted from the base station to the mobile station. Sent to.

The transmission information discriminator 134 of the mobile station extracts time information from the received transmission information and notifies it to the clock 136, and the clock 136 shows its own time information in accordance with the transmitted time information. After correction, the display 137 displays the time information output by the clock 136.

As described above, in the data transmission device of the seventh embodiment, the time information request is transmitted from the mobile station to the base station in addition to the normal information transmission between the base station and the mobile station. , The base station sends the reference clock information accordingly,
The mobile station corrects the clock time based on this information.

(Eighth Embodiment) The data transmission apparatus of the eighth embodiment is such that the time of the reference clock in the seventh embodiment can be corrected by the time information of the wired network. As shown in FIG. 5, a switch 152 for selectively switching between a connection for transmitting the transmission information of the wired network input through the input / output terminal 151 to the transmission information generator 153 and a connection for transmitting the time information of the wired network to the reference clock 161. I have it. Other configurations are the same as those of the seventh embodiment (FIG. 7).

In this device, the reference clock 161 of the base station is
It periodically connects to the wired network through the switch 152, obtains highly accurate time information of the wired network, and corrects the held time information. The operation at this time is the same as that of the third embodiment (FIG. 3).

Further, the base station transmits the information of the reference clock 161 in response to the request from the mobile station, and the mobile station corrects the time of the clock based on the information. The operation at this time is the same as that of the seventh embodiment (FIG. 7).

(Ninth Embodiment) The data transmission device of the ninth embodiment is configured so that the time of the reference clock in the seventh embodiment can be corrected by highly accurate time information obtained through a wireless line. As shown in FIG. 9, it is provided with a receiving antenna 187 for obtaining time information from the outside through a wireless line and a time signal receiver 188 for obtaining time information from the output signal of the receiving antenna 187. Other configurations are the same as those of the seventh embodiment (FIG. 7).

In this device, the reference clock 192 of the base station is
High-accuracy time information held by another device is obtained via the reception antenna 187 and the time signal receiver 188, and the time information held is corrected by this time information. The operation at this time is the same as that of the fifth embodiment (FIG. 5).

Further, the base station transmits the information of the reference clock 192 in response to the request from the mobile station, and the mobile station corrects the time of the clock 198 based on the information. The operation at this time is the same as that of the seventh embodiment (FIG. 7).

[0053]

As is apparent from the above description, in the data transmission device of the present invention, the time information of the clock of the mobile station can be corrected based on the time information of the reference clock provided in the base station.

Further, in the device provided with the mechanism for correcting the time information of the reference clock of the base station, the time information of the reference clock is always kept accurate, so that the clock of the mobile station always displays the accurate time. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data transmission device according to a first embodiment of the present invention,

FIG. 2 is a block diagram showing a configuration of a data transmission device according to a second embodiment of the present invention,

FIG. 3 is a block diagram showing a configuration of a data transmission device according to a third embodiment of the present invention,

FIG. 4 is a block diagram showing a configuration of a data transmission device according to a fourth embodiment of the present invention,

FIG. 5 is a block diagram showing a configuration of a data transmission device according to a fifth embodiment of the present invention,

FIG. 6 is a block diagram showing a configuration of a data transmission device according to a sixth embodiment of the present invention,

FIG. 7 is a block diagram showing a configuration of a data transmission device according to a seventh embodiment of the present invention,

FIG. 8 is a block diagram showing a configuration of a data transmission device according to an eighth embodiment of the present invention,

FIG. 9 is a block diagram showing a configuration of a data transmission device according to a ninth embodiment of the present invention,

FIG. 10 is an example of a basic structure of a wireless channel,

FIG. 11 is a block diagram showing a configuration of a conventional data transmission device.

[Explanation of Codes] 1, 21, 81, 101, 121, 181, 211 Input ends 2, 22, 43, 63, 82, 102, 122, 153, 182, 212 Transmission information generator 3, 23, 44, 64 , 85, 105, 130, 161, 192 Reference clock 4, 25, 45, 66, 86, 107, 123, 154, 183, 213 Frame component 5, 26, 46, 67, 87, 108, 124, 155, 184, 214 Modulator 6, 27, 47, 68, 88, 109, 125, 140, 156, 171, 185,
202,215 transmitter 7,28,48,69,89,110,216 transmitter antenna 8,29,49,70,83,90,103,111,187,217 receiver antenna 9,30,50,71,91 , 112, 127, 132, 156, 163, 189,
194, 218 Receiver 10, 31, 51, 72, 92, 113, 128, 133, 159, 164, 190,
195, 219 Demodulator 11, 32, 52, 73, 93, 114, 134, 165, 196, 220 Transmission information identifier 12, 33, 53, 74, 94, 115, 135, 166, 197, 221 Output end 13 , 34, 54, 75, 95, 116, 136, 167, 198, 222 Clock 14, 35, 55, 76, 96, 117, 137, 168, 199, 223 Display 24, 65, 106 Time information replacer 42 , 62, 152 Switch 84, 104, 188 Time signal receiver 129, 160, 191 Received signal discriminator 138, 169, 200 Time information request signal generator 126, 131, 157, 162, 186, 193 Transmit / receive antenna 41, 61 , 151 I / O end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Kayada 4-3-1, Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (7)

[Claims] 1. A data transmission apparatus comprising a base station and a mobile station, wherein the mobile station is provided with a clock for displaying the time. In the data transmission apparatus, the base station is provided with a reference clock, and the time information output by the reference clock. Is transmitted from the base station to the mobile station, the mobile station is provided with identification means for extracting the time information from the received transmission information of the base station, and the time information extracted by the identification means is output to the clock, A data transmission device characterized by correcting the time of a clock. 2. The base station comprises a frame structuring unit for structuring transmission information to be transmitted to a mobile station and time information output from the reference clock into a data string required on a wireless line. The data transmission device according to claim 1. 3. The transmission information generating means for generating transmission information by the base station, and when the output data of the transmission information generating means is meaningless, the output data of the transmission information generating means is set to the time of the reference clock. The data transmission device according to claim 1, further comprising time information replacement means for replacing the information with time. 4. The data transmission device according to claim 1, wherein the base station includes a correction unit for periodically correcting the time information of the reference clock. 5. The correction means includes a switching means for periodically connecting the reference clock to a wired network, and the time information of the reference clock is corrected by time information input from the wired network. The data transmission device according to claim 4. 6. The data transmission device according to claim 4, wherein the correction means includes a reception means for receiving a time signal, and the time information of the reference clock is corrected by the received time signal. 7. The mobile station comprises time information request signal generating means for generating a time information request signal, and the base station identifies the request signal transmitted from the mobile station, and the reference clock. 7. The data transmission device according to claim 1, wherein the time information of is transmitted to the mobile station.