JP2002290316A - Radio communication unit and transmission timing estimate method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication unit that can reduce a GT(Guard Time) more than that of a conventional technology, that is, can realize the enhanced transmission efficiency. SOLUTION: The radio communication unit of this invention is configured of a demodulation section 2 and a decode section 3 that extract a transmission power in a base station from control information of an output of a base station, an RSSI/RSCP measurement section 4 that measures a mean value of reception levels of a base station transmission wave, a propagation time calculation section 5 that calculates an attenuation by subtracting the mean value of the reception levels from the transmission power, calculates the transmission distance from the base station uniquely on the basis of the attenuation, and finally calculates the propagation delay time from the transmission distance, and a timing control section 6 that estimates the transmission timing of data sent to the base station on the basis of the reception timing of the base station transmission wave and the propagation delay time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus adopting TDMA (Time Division Multiple Access) as a multiple access system. The present invention relates to a wireless communication device that realizes smooth data communication, and a transmission timing estimation method in the data communication.

[0002]

2. Description of the Related Art A conventional wireless communication apparatus will be described below. For example, in data communication of a communication system employing TDMA, a propagation delay occurs between a BS (communication device operating as a base station) and an MT (communication device operating as a mobile station). This propagation delay time increases as the distance between the devices increases, and can be expressed as follows. Propagation delay time (s) = distance between devices (m) /3.0e8
(M / s)

FIG. 9 is a diagram showing operation timing between the BS and the MT. When the above propagation delay occurs, the transmission timing of the MT is based on the reception timing of the transmission data transmitted by the BS. Therefore, between the transmission timing of the BS and the transmission timing of the MT, a delay of twice the propagation delay time occurs as shown in FIG. In a conventional communication system, a GT that does not include any information necessary for communication is provided in anticipation of the propagation delay time × 2 times the delay.

[0004]

SUMMARY OF THE INVENTION However,
In the data communication between the conventional wireless communication devices employing TDMA, there is a problem that the transmission efficiency decreases as the transmission speed increases, because the ratio of the GT which can be set to one slot increases in proportion to the transmission speed.

[0005] When data communication is performed between conventional wireless communication devices via another communication device, a GT
However, since the length becomes longer in proportion to the number of relays, there is a problem that the transmission efficiency further decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and is directed to a direct data communication between a BS and an MT and a data communication between a BS and an MT when relaying another communication device. It is another object of the present invention to obtain a wireless communication device capable of shortening the GT, that is, capable of improving transmission efficiency, and a transmission timing estimation method at the time of data communication.

[0007]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, in a wireless communication apparatus according to the present invention, demodulation means for extracting a transmission power value at a base station from control information of a base station output (a demodulation unit 2, a decoding unit in an embodiment described later) 3) and a reception level measuring means (RSS) for measuring an average value of reception levels of base station transmission waves.
I / RSCP measuring unit 4) and subtracting the average value of the reception level from the transmission power value to calculate the attenuation, and uniquely calculating the transmission distance to the base station from the attenuation, A propagation delay time calculating means for calculating a propagation delay time from the transmission distance (corresponding to the propagation time calculation unit 5)
And transmission timing estimating means (corresponding to the timing control unit 6) for estimating the transmission timing of data to be transmitted to the base station based on the reception timing of the base station transmission wave and the propagation delay time. I do.

[0008] In the radio communication apparatus according to the next invention, demodulation means (corresponding to the demodulation unit 2 and the decoding unit 3) for extracting the transmission power value and the ID number of the mobile station from the random access information output from the mobile station. And a reception level measuring means (RSSI) for measuring an average value of reception levels of mobile station transmission waves.
/ RSCP measuring unit 4) and subtracting the average value of the reception level from the transmission power value to calculate the amount of attenuation, uniquely calculating the transmission distance to the mobile station from the amount of attenuation, and finally calculating A propagation delay time calculating means for calculating a propagation delay time from the transmission distance (corresponding to the propagation time calculating unit 5)
And a propagation delay time notifying unit (corresponding to the timing control unit 6) for notifying the mobile station of the propagation delay time.

[0009] In the wireless communication apparatus according to the next invention, the GP measured by the base station from the control information of the base station output.
Demodulation means (corresponding to the demodulation unit 2 and the decoding unit 3) for extracting S information, and the GPS information and G measured by the own device.
A propagation delay time calculating means (a propagation time calculating unit 5) that calculates a transmission distance to a base station based on PS information (equivalent to GPS 9) and finally calculates a propagation delay time from the transmission distance.
And transmission timing estimating means (corresponding to the timing control unit 6) for estimating the transmission timing of data to be transmitted to the base station based on the reception timing of the base station transmission wave and the propagation delay time. It is characterized by.

In the wireless communication apparatus according to the next invention, demodulation means (demodulation unit 2, demodulation unit 2) for extracting GPS information measured by the mobile station and an ID number of the mobile station from random access information output from the mobile station. (Corresponding to the decoding unit 3)
Propagation delay time calculating means for calculating a transmission distance to a mobile station based on the GPS information and GPS information (equivalent to GPS9) measured by the own device, and finally calculating a propagation delay time from the transmission distance ( (Corresponds to the propagation time calculation unit 5)
And a propagation delay time notifying unit (corresponding to the timing control unit 6) for notifying the mobile station of the propagation delay time.

In the transmission timing estimating method according to the next invention, the mobile station extracts a transmission power value at the base station from the control information of the base station output;
A reception level measuring step of measuring an average value of the reception level of the base station transmission wave, and calculating an attenuation amount by subtracting the average value of the reception level from the transmission power value, and the base station is uniquely determined from the attenuation amount. A propagation delay time calculating step of calculating a propagation delay time from the transmission distance, and a data transmitted to the base station based on the reception timing of the base station transmission wave and the propagation delay time. And a transmission timing estimating step of estimating the transmission timing.

[0012] In the transmission timing estimation method according to the next invention, the base station extracts a transmission power value and an ID number of the mobile station from random access information output from the mobile station. A receiving level measuring step of measuring an average value of the receiving level, and calculating an attenuation amount by subtracting the average value of the receiving level from the transmission power value, and uniquely calculating a transmission distance to the mobile station from the attenuation amount. Calculating, and finally, a propagation delay time calculating step of calculating a propagation delay time from the transmission distance, and a propagation delay time notifying step of notifying the propagation delay time to the mobile station. A transmission timing estimating step of estimating a transmission timing of data to be transmitted to the base station based on the reception timing of the base station transmission wave and the acquired propagation delay time. And executes a flop.

In the transmission timing estimating method according to the next invention, the mobile station extracts a GPS information measured by the base station from control information output from the base station. The transmission distance to the base station is calculated based on the GPS information measured by
A propagation delay time calculating step of calculating a propagation delay time from the transmission distance, and a transmission timing estimating step of estimating a transmission timing of data to be transmitted to the base station based on a reception timing of the base station transmission wave and the propagation delay time. , Is performed.

In the transmission timing estimating method according to the next invention, a demodulation step in which the base station extracts GPS information measured by the mobile station and an ID number of the mobile station from random access information output from the mobile station. And the G
A propagation delay time calculating step of calculating a transmission distance to the mobile station based on the PS information and the GPS information measured by the own device, and finally calculating a propagation delay time from the transmission distance; Performing a propagation delay time notification step of notifying the mobile station, and the mobile station estimates a transmission timing of data to be transmitted to the base station based on the reception timing of the base station transmission wave and the acquired propagation delay time The transmission timing estimating step is performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a wireless communication apparatus according to the present invention will be described in detail with reference to the drawings. The wireless communication apparatus according to the present invention uses TD as a multiple access method.
It is assumed that MA (Time Division Multiple Access) is adopted. The present invention is not limited by the embodiment.

Embodiment 1 FIG. 1 is a diagram illustrating a configuration of a wireless communication device (hereinafter, simply referred to as a communication device) according to a first embodiment of the present invention. 1, 1 and 8 are antennas, 2 is a demodulation unit, 3 is a decoding unit, 4 is an RSSI / RSCP measurement unit, 5 is a propagation time calculation unit, and 6 is a timing control unit. And 7 is a modulator.

In the present embodiment, the communication device (MT) on the mobile station side obtains the amount of attenuation from the average value of the RSSI of the received carrier and the transmission power value transmitted from the BS, and uniquely determines the propagation distance from the amount of attenuation. , And a propagation delay time is uniquely obtained from the propagation distance. Then, the transmission timing is determined by subtracting the propagation delay time from the reception timing of the data transmitted from the communication device (BS) on the base station side. Note that the RSSI in the MT includes instantaneous value fluctuations and the like, and therefore requires averaging over a predetermined period.

Here, the communication apparatus (M
The operation of T), that is, the transmission timing estimation method of the present embodiment will be described. FIG. 2 is a flowchart illustrating a transmission timing estimation method according to the first embodiment. First, the MT receives control information transmitted from the BS via the antenna 1 and obtains the transmission power value of the BS by the processing of the demodulation unit 2 and the decoding unit 3 (step S1). If the transmission power value from the BS is fixed, this process becomes unnecessary.

Next, the RSSI / RSCP measuring unit 4 measures the average value of RSSI or RSCP of the received carrier (step S2).

Next, the propagation time calculation unit 5 calculates the RSSI / RSCP measurement unit 4 from the transmission power value output from the decoding unit 3.
The measured output value (reception level) is subtracted, and the amount of attenuation is calculated (step S3). Then, from the attenuation, M
The transmission distance between T and BS is calculated (step S4),
Finally, a propagation delay time is calculated from the transmission distance (step S5).

Finally, the timing control unit 6 estimates and adjusts the transmission timing of data to be transmitted to the BS based on the reception timing of the BS transmission wave and the propagation delay time obtained by the propagation time calculation unit 5. (Step S
6).

FIG. 3 is a diagram showing the operation when the BS and MT perform direct communication using the above-described transmission timing estimation method. Here, Slot (1) transmitted by the BS arrives at the MT after a lapse of a propagation delay time (Transmission Delay). Then, in the MT, at the transmission timing determined as described above, that is, at the same transmission timing as the BS,
Send Slot (1) to BS. At this time, M
Slot (1) transmitted by T arrives at the BS after the elapse of the propagation delay time. That is, in the present embodiment, GT provided with “propagation delay time × 2” in the prior art is
It can be reduced to about “propagation delay time × 1”.

FIG. 4 is a diagram showing the operation when the BS and the MT perform communication via the relay communication device using the above-described transmission timing estimation method. Here, Slot (1) transmitted by the BS arrives at the relay device after the propagation delay time has elapsed. Then, the relay apparatus transmits Slot (1) at the same transmission timing as the BS determined by the above method, and the slot (1) arrives at the MT after a lapse of the propagation delay time. Next, in MT, B determined by the above method is used.
Slot (1) is transmitted at the same transmission timing as S,
The slot (1) arrives at the relay device after the elapse of the propagation delay time. Next, the relay apparatus transmits Slot (1) at the same transmission timing as the BS determined by the above method, and the slot (1) arrives at the BS after the propagation delay time has elapsed. That is, in the present embodiment, the GT that has conventionally increased according to the number of relays can be reduced to about “propagation delay time × 1”.

As described above, in the present embodiment, M
T is configured to uniquely calculate the propagation delay time based on the transmission power value of the BS and the reception level of the BS transmission wave, and further determine the transmission timing based on the propagation delay time. Thereby, even when performing direct data communication between BS and MT, or performing data communication between BS and MT while relaying another communication device,
The GT can be made shorter than in the related art, and the ratio of the GT to be slotted can be kept low, so that the transmission efficiency can be greatly improved.

Embodiment 2 In the first embodiment described above,
The MT uniquely determines the transmission timing by obtaining the propagation delay time by a predetermined method. On the other hand, in the present embodiment, the BS obtains the amount of attenuation from the average value of the RSSI of the received carrier and the transmission power value transmitted from the MT, determines the propagation distance uniquely from the amount of attenuation, and further calculates The propagation delay time is uniquely obtained from the propagation distance. Then, the propagation delay time obtained here is notified to the MT. In MT,
The transmission timing is determined by subtracting the propagation delay time from the reception timing of the BS transmission wave. In addition, BS
As in the first embodiment, the RSSI includes instantaneous value fluctuations and the like, and therefore requires averaging over a predetermined period. Further, the configuration of the BS is the same as that of FIG. 1 of the first embodiment.

Here, the operation of the communication apparatus of the present embodiment, that is, the transmission timing estimation method of the present embodiment will be described. FIG. 5 is a flowchart illustrating a transmission timing estimation method according to the second embodiment. First, BS
Then, the random access information transmitted from the MT via the antenna 1 is received, and the processing of the demodulation unit 2 and the decoding unit 3 obtains the transmission power value of the MT, the ID number of the MT, and the like (step S11). When the transmission power value from the MT is fixed, only the ID number is obtained.

Next, the propagation time calculation unit 5 subtracts the reception level of the MT transmission wave output from the RSSI / RSCP measurement unit 4 from the transmission power value output from the decoding unit 3, and calculates the attenuation (step S12). . Then, the transmission distance between the BS and the MT is calculated from the attenuation (Step S).
13) Finally, a propagation delay time is calculated from the transmission distance (step S14).

Finally, the timing control section 7 notifies the MT of the propagation delay time obtained by the propagation time calculation section 5 (step S15).

On the other hand, the MT estimates and adjusts the transmission timing of the data to be transmitted to the BS based on the reception timing of the BS transmission wave and the acquired propagation delay time (step S16). The operations performed when the BS and MT perform direct communication using the above-described transmission timing estimation method and when the BS and MT perform communication via the relay communication device using the above-described transmission timing estimation method are described above. 3 and FIG. 4.

As described above, in the present embodiment, B
S uniquely calculates the propagation delay time based on the transmission power value of the MT and the reception level of the MT transmission wave.
T is configured to determine the transmission timing based on the propagation delay time of the BS output. Thereby, BS and MT
Even when performing direct data communication between the BSs or performing data communication between the BS and the MT while relaying another communication device, the GT can be shortened as compared with the related art, and the GT having a slot can be reduced. Since the ratio can be kept low, the transmission efficiency can be greatly improved.

Embodiment 3 Embodiment 1 described above
In and 2, the propagation delay time is calculated based on the reception level obtained by the measurement and the obtained transmission power value. On the other hand, in the present embodiment, the MT calculates the propagation delay time based on the GPS information output from the BS and the GPS information measured by the own device.

FIG. 6 is a diagram showing a configuration of a communication apparatus according to a third embodiment of the present invention. In FIG. 6, 9 is GP.
S. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

Here, the communication device (M
The operation of T), that is, the transmission timing estimation method of the present embodiment will be described. FIG. 7 is a flowchart illustrating a transmission timing estimation method according to the third embodiment. First, the MT receives control information sent from the BS via the antenna 1 (step S21), and obtains GPS information from the BS by the processing of the demodulation unit 2 and the decoding unit 3 (step S22).

Next, the propagation time calculator 5 calculates the transmission distance between the MT and the BS from the GPS information output from the decoder 3 and the GPS information output from the GPS 9 (step S).
23) Finally, a propagation delay time is calculated from the transmission distance (step S24).

Finally, the timing controller 6 estimates and adjusts the transmission timing of data to be transmitted to the BS based on the reception timing of the BS transmission wave and the propagation delay time obtained by the propagation time calculator 5. (Step S
25). The operations performed when the BS and MT perform direct communication using the above-described transmission timing estimation method and when the BS and MT perform communication via the relay communication device using the above-described transmission timing estimation method are described above. 3 and FIG. 4.

As described above, in the present embodiment, M
T uniquely calculates the propagation delay time based on the GPS information output from the BS and the GPS information measured in the own device,
Further, the transmission timing is determined based on the propagation delay time. Thereby, even when performing direct data communication between the BS and the MT or performing data communication between the BS and the MT while relaying another communication device, the GT can be made shorter than in the related art. Can,
Since the ratio of GTs used as slots can be kept low, the transmission efficiency can be greatly improved. Also, by measuring the propagation delay time using the GPS information, the amount of calculation can be significantly reduced.

Embodiment 4 FIG. In the third embodiment described above,
The MT uniquely determines the transmission timing by obtaining the propagation delay time by a predetermined method. On the other hand, in the present embodiment, the BS uniquely obtains the propagation delay time based on the GPS information of the MT output and the GPS information measured in the own device. Then, the propagation delay time obtained here is expressed as MT
Notify. In the MT, the transmission timing is determined by subtracting the propagation delay time from the reception timing of the BS transmission wave. The configuration of the BS is the same as that of FIG. 6 of the third embodiment.

Here, the operation of the communication apparatus of the present embodiment, that is, the transmission timing estimation method of the present embodiment will be described. FIG. 8 is a flowchart illustrating a transmission timing estimating method according to the fourth embodiment. First, BS
Then, random access information transmitted from the MT via the antenna 1 is received, and the GPS information of the MT, the ID number of the MT, and the like are obtained by the processing of the demodulation unit 2 and the decoding unit 3 (step S31).

Next, the propagation time calculating section 5 calculates the transmission distance between the MT and the BS from the GPS information output from the decoding section 3 and the GPS information output from the GPS 9 (step S32), and finally the transmission distance. Is calculated (step S33).

Finally, the timing controller 6 notifies the MT of the propagation delay time obtained by the propagation time calculator 5 (step S34).

On the other hand, the MT estimates and adjusts the transmission timing of data to be transmitted to the BS based on the reception timing of the BS transmission wave and the acquired propagation delay time (step S35). The operations performed when the BS and MT perform direct communication using the above-described transmission timing estimation method and when the BS and MT perform communication via the relay communication device using the above-described transmission timing estimation method are described above. 3 and FIG. 4.

As described above, in the present embodiment, B
S uniquely calculates a propagation delay time based on the GPS information of the MT output and the GPS information measured in the own device,
Further, the MT is configured to determine the transmission timing based on the propagation delay time of the BS output. This allows
Even when performing direct data communication between the BS and the MT or performing data communication between the BS and the MT while relaying another communication device, the GT can be made shorter than in the related art, Since the ratio of GT that can be suppressed can be suppressed low, the transmission efficiency can be greatly improved. Also, by measuring the propagation delay time using the GPS information, the amount of calculation can be significantly reduced.

In the first to fourth embodiments, in particular,
The transmission timing estimation process between the BS and the MT has been described. However, the present invention is not limited to this.
It is also applicable between MTs.

[0044]

As described above, according to the present invention, the MT uniquely calculates the propagation delay time based on the transmission power value of the BS and the reception level of the BS transmission wave. The transmission timing is determined based on the time. As a result, the GT can be made shorter than in the related art, and the ratio of the GT to be slotted can be reduced, so that it is possible to obtain a wireless communication device capable of greatly improving transmission efficiency. To play.

According to the next invention, the BS uniquely calculates the propagation delay time based on the transmission power value of the MT and the reception level of the MT transmission wave, and furthermore, the MT calculates the propagation delay time of the BS output. The transmission timing is determined based on this. As a result, the GT can be made shorter than in the related art, and the ratio of the GT to be slotted can be reduced, so that it is possible to obtain a wireless communication device capable of greatly improving transmission efficiency. To play.

According to the next invention, the MT calculates the propagation delay time uniquely based on the GPS information output from the BS and the GPS information measured in its own device, and further transmits the transmission time based on the propagation delay time. The timing is determined. As a result, the GT can be made shorter than in the related art, and the ratio of GTs used as slots can be reduced, so that it is possible to obtain a wireless communication device capable of greatly improving transmission efficiency. To play. Also, by measuring the propagation delay time using the GPS information, it is possible to obtain a wireless communication device capable of greatly reducing the amount of calculation.

According to the next invention, the BS uniquely calculates the propagation delay time based on the GPS information of the MT output and the GPS information measured in its own device.
The transmission timing is determined based on the propagation delay time of the BS output. This allows G to be higher than in the prior art
Since T can be shortened and the ratio of GT to be slotted can be reduced, it is possible to obtain a wireless communication device capable of greatly improving transmission efficiency.
This has the effect. Also, by measuring the propagation delay time using the GPS information, it is possible to obtain a wireless communication device capable of greatly reducing the amount of calculation.

According to the next invention, the MT uniquely calculates the propagation delay time based on the transmission power value of the BS and the reception level of the BS transmission wave, and further sets the transmission timing based on the propagation delay time. I decided to decide. As a result, the GT can be made shorter than in the related art, and the ratio of GTs used as slots can be kept low, so that the transmission efficiency can be greatly improved.

According to the next invention, the BS uniquely calculates the propagation delay time based on the transmission power value of the MT and the reception level of the MT transmission wave, and furthermore, the MT calculates the propagation delay time of the BS output. The transmission timing is determined based on this. As a result, the GT can be made shorter than in the related art, and the ratio of GTs used as slots can be kept low, so that the transmission efficiency can be greatly improved.

According to the next invention, the MT uniquely calculates the propagation delay time based on the GPS information output from the BS and the GPS information measured in its own device, and further transmits the transmission time based on the propagation delay time. The timing was decided. As a result, the GT can be made shorter than in the related art, and the ratio of GTs used as slots can be kept low, so that the transmission efficiency can be greatly improved. Further, by measuring the propagation delay time using the GPS information, there is an effect that the amount of calculation can be significantly reduced.

According to the next invention, the BS uniquely calculates the propagation delay time based on the GPS information of the MT output and the GPS information measured in its own device.
The transmission timing is determined based on the propagation delay time of the BS output. This allows G to be higher than in the prior art
Since T can be shortened and the ratio of GT to be slotted can be reduced, there is an effect that transmission efficiency can be greatly improved. Also, GP
Measuring the propagation delay time using the S information has the effect of greatly reducing the amount of computation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a communication apparatus according to a first embodiment of the present invention;

FIG. 2 is a flowchart showing a transmission timing estimation method according to the first embodiment.

FIG. 3 is a diagram illustrating an operation when a BS and an MT perform direct communication.

FIG. 4 is a diagram illustrating an operation when a BS and an MT perform communication via a relay communication device.

FIG. 5 is a flowchart illustrating a transmission timing estimation method according to the second embodiment.

FIG. 6 is a diagram showing a configuration of a communication device according to a third exemplary embodiment of the present invention.

FIG. 7 is a flowchart illustrating a transmission timing estimation method according to the third embodiment.

FIG. 8 is a flowchart illustrating a transmission timing estimation method according to the fourth embodiment.

FIG. 9 is a diagram showing operation timing between a BS and an MT.

[Explanation of symbols]

1, 8 antenna, 2 demodulation section, 3 decoding section, 4
RSSI / RSCP measurement unit, 5 propagation time calculation unit, 6
Timing control unit, 7 modulation unit, 9 GPS.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 AA11 CC02 CC05 DD01 DD02 DD03 EE05 HH00 KK12 LL12 RR02 5K067 AA13 BB02 BB21 CC04 DD17 EE02 EE06 EE10 EE72 FF16 HH21

Claims (8)

[Claims] 1. A mobile station-side radio communication apparatus employing TDMA as a multiple access system, comprising: demodulation means for extracting a transmission power value at a base station from control information of a base station output; Reception level measuring means for measuring the average value, calculating the attenuation by subtracting the average value of the reception level from the transmission power value, uniquely calculating the transmission distance to the base station from the attenuation, A propagation delay time calculating means for calculating a propagation delay time from the transmission distance; and a transmission timing for estimating a transmission timing of data to be transmitted to the base station based on a reception timing of the base station transmission wave and the propagation delay time. A wireless communication device comprising: estimating means. 2. A base station-side radio communication apparatus adopting TDMA as a multiple access system, a demodulation means for extracting a transmission power value and an ID number of the mobile station from random access information output from the mobile station, Reception level measuring means for measuring the average value of the reception level of the wave, and calculating the amount of attenuation by subtracting the average value of the reception level from the transmission power value, and uniquely calculating the transmission distance from the mobile station from the amount of attenuation. And finally, a propagation delay time calculating means for calculating a propagation delay time from the transmission distance, and a propagation delay time notifying means for notifying the mobile station of the propagation delay time, characterized by comprising: Wireless communication device. 3. A demodulation means for extracting GPS information measured by a base station from control information of a base station output, in a mobile station-side radio communication apparatus adopting TDMA as a multiple access system; A propagation delay time calculating means for calculating a transmission distance to the base station based on the GPS information measured in step (a) and finally calculating a propagation delay time from the transmission distance; And a transmission timing estimating means for estimating a transmission timing of data to be transmitted to the base station based on the delay time. 4. A demodulator for extracting GPS information measured by a mobile station and an ID number of the mobile station from random access information output from the mobile station in a base station-side radio communication apparatus employing TDMA as a multiple access system. Means for calculating a transmission distance to a mobile station based on the GPS information and GPS information measured by the own device, and finally calculating a propagation delay time from the transmission distance; And a propagation delay time notifying unit for notifying the mobile station of the propagation delay time. 5. A transmission timing estimating method in data communication between a base station and a mobile station, the mobile station extracting a transmission power value at the base station from control information of the base station output; A reception level measuring step of measuring an average value of a reception level of a transmission wave; and calculating an attenuation amount by subtracting the average value of the reception level from the transmission power value, and uniquely transmitting the signal to the base station from the attenuation amount. Calculating a distance and finally calculating a propagation delay time from the transmission distance; and transmitting the data to be transmitted to the base station based on the reception timing of the base station transmission wave and the propagation delay time. A transmission timing estimating step of estimating a timing; 6. A method for estimating a transmission timing in data communication between a base station and a mobile station, the base station extracting a transmission power value and an ID number of the mobile station from random access information output from the mobile station. Step, a reception level measuring step of measuring the average value of the reception level of the mobile station transmission wave, and calculating the amount of attenuation by subtracting the average value of the reception level from the transmission power value, uniquely from the amount of attenuation Calculating the transmission distance with the mobile station, finally, a propagation delay time calculation step of calculating a propagation delay time from the transmission distance, a propagation delay time notification step of notifying the propagation delay time to the mobile station, And the mobile station estimates the transmission timing of the data to be transmitted to the base station based on the reception timing of the base station transmission wave and the acquired propagation delay time. Transmission timing estimation method and transmitting timing estimation step of the execution. 7. A method for estimating transmission timing in data communication between a base station and a mobile station, the mobile station extracting a GPS information measured by the base station from control information output from the base station; A propagation delay time calculating step of calculating a transmission distance to a base station based on the GPS information and GPS information measured by the own device, and finally calculating a propagation delay time from the transmission distance; A transmission timing estimating step of estimating a transmission timing of data to be transmitted to a base station based on the reception timing and the propagation delay time. 8. A method of estimating transmission timing in data communication between a base station and a mobile station, comprising the steps of: (a) determining, from random access information output from the mobile station, GPS information measured by the mobile station; A demodulation step of extracting an ID number; and a propagation delay for calculating a transmission distance to a mobile station based on the GPS information and the GPS information measured by the own device, and finally calculating a propagation delay time from the transmission distance. A time calculating step, and a propagation delay time notifying step of notifying the mobile station of the propagation delay time.The mobile station performs a base station based on the reception timing of the base station transmission wave and the acquired propagation delay time. A transmission timing estimating step of estimating a transmission timing of data to be transmitted to the station.