JP2003008507A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system where a mobile station 20 suppresses a noise imposed on other mobile stations when the mobile station 20 performs communication with a base station 10. SOLUTION: The mobile station 20 calculates position information and transmits the position information to the base station 10, and the base station 10 receives the position information, calculates maximum transmission power of the mobile station 20 and transmits information of the maximum transmission power to the mobile station 20. The mobile station 20 receives the information of the maximum transmission power and makes transmission with a transmission power being the maximum transmission power or below.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a radio communication system for performing radio communication between a base station and a mobile station.

[0002]

2. Description of the Related Art Conventionally, TPC-based transmission power control has been adopted in a CDAM type mobile phone system.

Specifically, the base station obtains received power based on the received signal from the mobile station and also obtains TPC data (hereinafter referred to as downlink TPC data) based on this received power. Then, the base station transmits the downlink TPC data to the mobile station.

The downlink TPC data is used by the base station to instruct the mobile station to increase, decrease, or maintain constant the transmission power. The mobile station transmits based on the downlink TPC data. Transmission data is transmitted with electric power.

Further, the mobile station obtains received power based on the received signal from the base station and also obtains TPC data (hereinafter referred to as upstream TPC data) based on this received power. Then, the mobile station transmits the uplink TPC data to the base station. This uplink TPC data is transmitted from the mobile station to the base station by increasing or decreasing the transmission power, or
The base station transmits the transmission data to the mobile station with the transmission power based on the uplink TPC data, which is an instruction to keep it constant.

As described above, by instructing the base station and the mobile station to increase, decrease, or maintain constant the transmission power, it is possible to avoid increasing the transmission power more than necessary, and The base station, together with the mobile station, can ensure good reception without giving noise to the mobile station.

In addition, at the time of an emergency call, the base station instructs the mobile station to transmit at the maximum transmission power instead of the above TPC data, so that the mobile station can transmit at the maximum transmission power. It has been proposed to send an emergency call to a base station. As a result, the mobile station can reliably transmit the emergency call to the base station.

[0008]

However, when the mobile station is located in the vicinity of the base station, when the mobile station transmits the emergency notification to the base station with the maximum transmission power as described above, the mobile station transmits more than necessary. The power will send an emergency call to the base station. Therefore, the transmission of the emergency call gives noise to other mobile stations.

In view of the above points, the present invention suppresses noise to other mobile stations when the mobile station communicates with the base station by instructing the mobile station to a suitable maximum transmission power value. It is an object of the present invention to provide a wireless communication system capable of performing the above.

[0010]

In order to achieve the above object, the present invention is, in the invention described in claim 1, a radio communication system configured so that a base station and a mobile terminal communicate with each other. The mobile station calculates the position information of the mobile station itself (100, 112, 132) and the mobile station transmitting means (27, 2) for transmitting the uplink transmission information to the base station.
8) and mobile station transmission control means (10) for controlling the mobile station transmission means so that the position information is transmitted as uplink transmission information.
2, 115, 135), the base station receives the position information as uplink transmission information (200,
210, 230) and base station calculation means (203, 213,) for calculating the maximum transmission power value of the mobile station according to the position information.
233) and base station instruction means (206, 216, 236) for instructing the maximum transmission power value to the mobile station.

In this way, the maximum transmission power value is obtained according to the position information of the mobile station, and the base station instructs the mobile station of this maximum transmission power value. This allows the base station to
A suitable maximum transmission power value can be indicated to the mobile station, and the mobile station
It is possible to transmit to the base station with a transmission power value that is less than or equal to the maximum transmission power value. Therefore, when the mobile station communicates with the base station, noise with respect to other mobile stations can be suppressed.

Specifically, as in the invention described in claim 2, the base station has base station transmitting means (16, 17) for transmitting the downlink transmission information to the mobile station, and the base station instructing means is The base station transmitting means may be controlled so that the maximum transmission power value is transmitted as downlink transmission information. Further, as in the invention according to claim 3, the base station instructing means may control the base station transmitting means so as to transmit the downlink transmission information at a transmission power value equal to or less than the maximum transmission power value.

Here, in determining the transmission power value in the mobile station, the invention described in claim 4 may be applied.

That is, in the invention described in claim 4, the mobile station adds a predetermined value to the previous transmission power value of the uplink transmission information to obtain the uplink addition power value, and this uplink addition power value is the maximum transmission value. When the mobile station determination means (121, 141) for determining whether or not the power value is equal to or more than the power value and the mobile station determination means determines that the uplink addition power value is less than the maximum transmission power value, the uplink transmission information When it is determined by the first mobile station setting means (122, 142) and the mobile station determination means that set the transmission power value to increase, the uplink addition power value is greater than or equal to the maximum transmission power value, the uplink transmission information. Second setting means (1) for prohibiting an increase in the transmission power value of
24, 143).

The base station may apply the invention of claim 5 in determining the transmission power value.

That is, in the invention according to claim 5, the base station adds a predetermined value to the previous transmission power value of the downlink transmission information to obtain the downlink addition power value, and the downlink addition power value is the maximum transmission value. When the base station determining means (221, 241) for determining whether or not the power value is equal to or more than the power value and the base station determining means determines that the downlink added power value is less than the maximum transmission power value, the downlink transmission information When the first base station setting means (222, 242) for setting the transmission power value to increase and the base station determination means determine that the downlink addition power value is greater than or equal to the maximum transmission power value, the downlink transmission information Second base station setting means (224, 243) for prohibiting an increase in the transmission power value of the above.

Further, in the invention according to claim 6, the base station has a storage means (14a) for storing the maximum transmission power value of the mobile station for each preset position information, and the base station calculation means is , Of the maximum transmission power values stored for each position information,
It is characterized in that the maximum transmission power value corresponding to the received position information is selected. Thereby, the maximum transmission power value can be obtained by a simple process.

In the invention described in claim 7, the mobile station transmission control means controls the mobile station transmission means so as to transmit the transmission power value of the uplink transmission information as the uplink transmission information, and the base station reception means, The base station receives the transmission power value of the uplink transmission information as the uplink transmission information, and the base station updates the maximum transmission power value of each stored position information according to the transmission power value of the received uplink transmission information ( 272).

As described above, since the stored maximum transmission power value can be updated according to the transmission power value of the uplink transmission information, a good maximum transmission power value can be obtained corresponding to the position information.

In the invention according to claim 8, the base station comprises a base station receiving / measuring means (201, 211) for measuring the reception level of the uplink transmission information, and the measured reception level of the uplink transmission information is a predetermined threshold value. It has a level determination means (270) for determining whether or not the above, and when the level determination means determines that the reception level of the uplink transmission information is equal to or higher than a predetermined threshold value, the updating means updates the maximum transmission power value. It is characterized in that when the permission is granted and the level determination means determines that the reception level of the uplink transmission information is less than the predetermined threshold value, the update means prohibits the update of the maximum transmission power value.

Thus, when the reception level of the uplink transmission information is equal to or higher than the predetermined threshold value, the maximum transmission power value is permitted to be updated, and when the reception level of the uplink transmission information is less than the predetermined threshold value, the maximum transmission power value is updated. Prohibit Therefore, since the maximum transmission power value can be updated only when necessary, a better maximum transmission power value can be obtained.

Here, as in the invention described in claim 9,
A method of communicating with a base station for communicating with a mobile station, comprising: receiving position information of the mobile station (200, 210, 23).
0), a step (203, 213, 233) of calculating the maximum transmission power value of the mobile station according to the position information, and a step (206, 21) of instructing the mobile station of the maximum transmission power value.
6, 236) may be adopted.

According to the invention described in claim 10, a mobile station which communicates with a base station, the calculating means (100, 112, 132) for calculating the position information of the mobile station itself, and transmission to the base station. A transmission means (27, 28) for transmitting information, a transmission control means (102, 115, 135) for controlling the transmission means so as to transmit position information as transmission information, and a maximum transmission power value corresponding to the position information. Receiving means (110, 130) for receiving as an instruction from the base station may be adopted.

According to an eleventh aspect of the present invention, a computer of a mobile station having a transmitting means for transmitting the transmission information to the base station is used as means for calculating the position information of the mobile station itself and the position information as transmission information. A program that functions as a unit that controls the transmitting unit to transmit and a unit that receives the maximum transmission power value corresponding to the position information as an instruction from the base station may be adopted.

According to the invention of claim 12,
A computer of a base station having a transmission means for transmitting transmission information to a mobile station, means for calculating position information of the base station itself, means for controlling the transmission means so as to transmit the position information as transmission information, and position information It is also possible to employ a program that functions as a means for receiving the maximum transmission power value corresponding to the above as an instruction from the mobile station.

Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0027]

FIG. 1 shows an embodiment of a wireless communication system of the present invention. FIG. 1 is a schematic diagram showing the configuration of a wireless communication system. The wireless communication system is a base station (B
S) 10 and mobile station (MS) 20, and is configured so that the base station 10 can wirelessly communicate with the mobile station 20 in the wireless area 30.

Next, the electric circuit configurations of the base station 10 and the mobile station 20 will be described with reference to FIG. FIG. 2 is a block diagram showing electric circuit configurations of the base station 10 and the mobile station 20.

The base station 10 comprises a receiving antenna 11, a demodulating unit 12, a control unit 13, a memory 14, a modulating unit 15, a power amplification amplifier 16, and a transmitting antenna 17. The receiving antenna 11 receives communication data from the mobile station 20 (hereinafter referred to as upstream communication data) using electromagnetic waves as a medium, and outputs upstream communication data. The demodulation unit 12 demodulates the upstream communication data and outputs the demodulated data.

Here, the upstream communication data is as shown in FIG.
As shown in (c), in addition to the emergency communication information (such as voice information and image information), it has TPC data, position information, etc., which will be described later. The TPC data and the position information are separated. The control unit 13 also executes processing such as call processing and transmission power control processing.

The memory 14 stores computer programs such as call processing and transmission power control processing, and has a database 14a. The database 14a stores the maximum transmission power value of the mobile station 20 for each position information of the mobile station 20.

The modulator 15 is controlled by the controller 13 to modulate downlink communication data, which will be described later, to obtain downlink modulated data. Further, the power amplification amplifier 16 is controlled by the control unit 13 to power-amplify the downlink modulation data and output the downlink power amplification communication data. The transmitting antenna 17 is
Downlink power amplification communication data is transmitted using electromagnetic waves as a medium.

The mobile station 20 includes a reception antenna 21, a demodulation unit 22, a GPS antenna 23, a control unit 24, a memory 25,
The modulation unit 26, the power amplification amplifier 27, and the transmission antenna 28 are included. The receiving antenna 21 receives the downlink communication data using electromagnetic waves as a medium and outputs the downlink communication data. Here, the downlink communication data includes TPC data, which will be described later, maximum transmission power value, and the like, in addition to emergency communication information (such as voice information and image information).

The demodulation section 22 demodulates the downlink communication data and outputs the demodulated data. The GPS antenna 23 receives satellite signals from, for example, three or more artificial satellites using electromagnetic waves as a medium, and outputs them to the control unit 24. Control unit 2
4 has a microcomputer, which executes processing such as call processing and transmission power control processing, as will be described later. The memory 25 stores computer programs such as call processing and transmission power control processing.

The modulator 26 is controlled by the controller 24 to modulate the upstream communication data and obtain the upstream modulation data.

The power amplification amplifier 27 is controlled by the control unit 13 and power-amplifies the upstream modulation data and outputs the upstream power amplification communication data. The transmission antenna 28 transmits the upstream power amplification communication data using electromagnetic waves as a medium.

Next, the operation of this embodiment will be described with reference to FIGS.
It will be described based on 1. 4 to 9 are flowcharts showing the transmission power control processing of the control units 13 and 24 of the base station 10 and the mobile station 20, respectively. The control units 13 and 24
The transmission power control processing is executed according to the flowcharts shown in FIGS.

First, the control unit 24 in the mobile station 20
The processes of steps 100 to 104 are executed as follows.

That is, the satellite signal is received from each artificial satellite through the GPS antenna 23, and the position information of the mobile station itself is calculated based on each satellite signal (step 100). Further, as shown in FIG. 3A, the modulator 26 combines the communication information with the position information to generate upstream communication data (hereinafter referred to as upstream first initial communication data). The upstream first initial communication data is input to the power amplification amplifier 27 by the modulator 26 (step 101).

As the position information, for example, the latitude, longitude and height of the mobile station itself are adopted.

Next, a gain (hereinafter, referred to as an upstream first initial gain) is set in the power amplification amplifier 27, and the upstream first initial communication data is power-amplified by the upstream first initial gain. 27 is controlled (steps 102 and 104).

As a result, the power amplification amplifier 27 outputs the upstream first initial amplified communication data at the upstream first initial transmission power value, so that the transmitting antenna 28 transmits the upstream first initial amplified communication data as an electromagnetic wave medium. To send as.

However, the above-described upstream first initial transmission power value is calculated in advance based on the reception noise level and the like, and this upstream first initial transmission power value is stored in the memory 25 ( Step 103). Further, the upstream first initial gain is obtained based on the upstream first initial transmission power value.

Next, the control unit 13 in the base station 10
The processes of steps 200 to 208 are executed as follows.

That is, the upstream first initial amplified communication data is received through the receiving antenna 11 (step 200), and the received power level of the upstream first initial amplified communication data is measured (step 201). Further, the demodulation unit 12 causes the position information in the mobile station 20 to be extracted from the first upstream amplified communication data (step 20).
2).

Next, the maximum transmission power value corresponding to the extracted position information is selected from the database 14a (step 203). The details of the selection process of the maximum transmission power value will be described later.

Also, TPC data is generated based on the received power level measured in step 201 (step 204).

The TPC data is the base station 10
However, for the mobile station, the transmission power increases, decreases, or
This is an instruction to keep it constant, and details of generation of TPC data will be described later.

Next, the modulator 15 causes the step 20 to be performed.
As shown in FIG. 3B, the maximum transmission power value and TPC data obtained in steps 3 and 204 are combined with communication information to generate downlink first initial communication data (step 205).

Next, a gain (hereinafter, referred to as a downlink first initial gain) is set in the power amplification amplifier 16, and the power is set so that the downlink first initial communication data is power-amplified by the downlink first initial gain. The amplifier 16 is controlled (steps 206, 208).

As a result, the power amplification amplifier 16 outputs the downlink first initial amplified communication data at the downlink first initial transmission power value, so that the transmitting antenna 17 outputs the downlink first initial amplified communication data as an electromagnetic wave medium. To send as.

Here, the above-mentioned first downlink initial transmission power value is a value equal to or less than the maximum transmission power value, and is calculated based on the reception noise level and the like (step 207). Further, the downlink first initial gain is obtained based on the downlink first initial transmission power value.

Next, the control unit 24 in the mobile station 20
The processing of steps 110 to 125 is executed as follows.

That is, the downlink first initial amplified communication data is received through the receiving antenna 21 (step 110), and the received power level of the downlink first initial amplified communication data is measured (step 111). Furthermore, GPS
Satellite signals are received from the respective artificial satellites through the antenna 23, and the position information of the mobile station itself is calculated based on the satellite signals (step 112).

Next, TPC data is generated based on the received power level measured in step 111 (step 113). The TPC data is used for the mobile station 20.
However, it instructs the base station 10 to increase, decrease, or maintain constant the transmission power, and details of generation of TPC data will be described later.

Next, the modulator 26 causes the position information, T
PC data (determined in steps 112 and 113)
Is combined with the communication information as shown in FIG. 3C to generate the second upstream initial communication data (step 1
14).

Next, a gain (hereinafter referred to as an upstream second initial gain) is set in the power amplification amplifier 27, and the upstream second initial communication data is power-amplified by the upstream second initial gain. The power amplification amplifier 27 is controlled (steps 115 and 125).

As a result, the power amplification amplifier 27 outputs the upstream second initial amplified communication data at the upstream second initial transmission power value, so that the transmission antenna 28 outputs the upstream second initial amplified communication data as an electromagnetic wave. Send as medium.

Here, the above-mentioned second upstream initial gain is generated by the control section 24 as follows.

First, the maximum transmission power value (selected in step 203) is extracted from the downlink first initial amplification communication data received in step 110, and the extracted maximum transmission power value is stored in the memory 25. (Step 11
6).

Next, the previous transmission power value in the power amplification amplifier 27, that is, the first upstream initial transmission power value is called from the memory 25 (step 117). Along with this, the TPC data is extracted from the downlink first initial amplification communication data (step 118).

Next, the TPC extracted in step 118
The processing of steps 119 to 120 is performed based on the data.

Specifically, in step 119, the base station 1
It is determined whether or not the instruction to change the transmission power is received from 0. When it is determined that the instruction to change the transmission power is received from the base station 10, the process proceeds to step 120.

Here, it is determined whether or not the instruction to increase the transmission power is received from the base station 10. When it is determined that the instruction to increase the transmission power is received from the base station 10, the process proceeds to step 121. .

Here, the uplink first initial transmission power value (called in step 117) is set to a predetermined value (for example, 1 db,
Alternatively, 2 db) is added to obtain an added power value (hereinafter, referred to as an upstream initial added power value). Further, step 11
It is determined whether the maximum transmission power value extracted in 6 is larger than the upstream initial addition power value.

When it is determined that the maximum transmission power value extracted in step 116 is larger than the upstream initial addition power value, the upstream initial addition power is set as the above-mentioned second upstream initial transmission power value. A value is set and stored in the memory 25 (step 122).

That is, the upstream second initial transmission power value is larger than the upstream first initial transmission power value by a predetermined value.

Further, when it is determined in step 121 that the upstream initial added power value is larger than the maximum transmission power value extracted in step 116, the maximum second upstream initial transmission power value is set to the maximum value. The same transmission power value is set and stored in the memory 25 (step 124).

When it is determined in step 120 that the transmission power reduction instruction is received from the base station 10, a predetermined value (for example, 1
db or 2db) is subtracted to subtract the power value (hereinafter,
(Upstream initial subtraction power value). With this,
As the above-mentioned second upstream initial transmission power value, the upstream initial subtraction power value is set and stored in the memory 25 (step 1
23).

That is, the upstream second initial transmission power value is smaller than the upstream first initial transmission power value by a predetermined value.

When it is determined in step 119 that the base station 10 has instructed to keep the transmission power constant, the process proceeds to step 119a, where the first upstream second transmission power value is the first The same value as the initial mobile station transmission power value is set and stored in the memory 25.

That is, the upstream second initial transmission power value is maintained at the same value as the upstream first initial transmission power value.

Thus, steps 119a, 122-
At 124, the upstream second initial transmission power value is stored in the memory 25, and the upstream second initial gain corresponding to this upstream second initial transmission power value is obtained. Further, as described above, the power amplification amplifier 27 power-amplifies the upstream second initial communication data based on the upstream second initial gain. Therefore, the transmitting antenna 28 transmits the upstream second initial amplified communication data to the upstream second Output at the initial transmission power value.

Next, the control unit 13 in the base station 10
The processes of steps 210 to 225 are executed as follows.

First, in step 210, the receiving antenna 1
When the second initial amplified communication data is received through 1
The reception power level of this upstream second initial amplification communication data is measured (step 211).

Further, the demodulating unit 12 causes the position information of the mobile station 20 to be extracted from the second upstream amplified communication data (step 212). Then, the maximum transmission power value corresponding to the extracted position information is selected from the database 14a as described later (step 213).

Then, TPC data is generated based on the received power level measured in step 211 (step 214).

Next, the modulator 15 combines the maximum transmission power value (selected in step 213) and the TPC data (generated in step 214) with the communication information as shown in FIG. 3B. By doing so, downlink second initial communication data is generated (step 215). As a result, the downlink second initial communication data is input to the power amplification amplifier 16.

Next, a gain (hereinafter, referred to as a downlink second initial gain) is set in the power amplification amplifier 16, and power amplification is performed so that the downlink second initial communication data is power-amplified by the downlink second initial gain. The amplifier 16 is controlled (steps 216 and 225). As a result, the power amplifier 16
Outputs the downlink second initial amplified communication data with the downlink second initial transmission power value, the transmitting antenna 17 transmits the downlink second initial amplified communication data.

Here, the above-described second downlink initial gain is generated by the control unit 13 as follows.

First, from the memory 14, the power amplifier 1
The previous transmission power value in step 6, ie, the downlink first initial transmission power value is called (step 217). Further, the TPC data is extracted from the upstream second initial amplification communication data (step 218). Based on the extracted TPC data, the processes of steps 219 to 221 are performed as follows.

First, in step 219, it is determined whether or not an instruction to change the transmission power is received from the mobile station 20.
Then, when it is determined that the instruction to change the transmission power is received from the mobile station 20, the process proceeds to step 220.

Here, it is determined whether or not the instruction to increase the transmission power is received from the mobile station 20, and when it is determined that the instruction to increase the transmission power is received from the mobile station 20, the process proceeds to step 221. .

Then, in step 221, a predetermined value is added to the downlink first initial transmission power value called in step 217 to obtain an added power value (hereinafter referred to as downlink initial added power value). Furthermore, it is determined whether or not the maximum transmission power value selected in step 213 is larger than the downlink initial addition power value.

When it is determined that the maximum transmission power value selected in step 213 is larger than the downlink initial addition power value, the downlink initial addition power value is set as the above-mentioned downlink second initial transmission power value. Is set and stored in the memory 14 (step 222).

Further, when it is determined in step 221 that the downlink initial added power value is larger than the maximum transmission power value selected in step 213, the above-mentioned downlink second initial transmission power value is: The maximum transmission power value selected in step 213 is set to the same value and stored in the memory 14 (step 224).

Further, when it is determined in step 220 that the instruction to reduce the transmission power is received from the mobile station 20, a predetermined value is subtracted from the first downlink initial transmission power value to subtract the power value (hereinafter, The downlink initial subtraction power value) is obtained. Along with this, the downlink initial subtraction power value is stored in the memory 14 as the above-mentioned downlink second initial transmission power value (step 223).

Further, when it is determined in step 219 that the mobile station 20 has instructed to keep the transmission power constant, the process proceeds to step 219a, where the above-mentioned downlink second initial transmission power value is set. , The same value as the first downlink initial transmission power value is stored in the memory 14.

That is, the above-mentioned downlink second initial transmission power value is maintained at the same value as the downlink first initial transmission power value.

Thus, steps 219a and 222-222
At 224, the downlink second initial transmission power value is stored in the memory 14, and the downlink second initial gain corresponding to the downlink second initial transmission power value is obtained. Further, as described above, the power amplification amplifier 16 power-amplifies the downlink second initial communication data with the downlink second initial gain, so that the transmitting antenna 17 transmits the downlink second initial amplified communication data to the downlink second initial gain communication data. Output at the initial transmission power value.

Next, the control unit 24 in the mobile station 20
The processes of steps 130 to 145 are executed as follows. Here, step 130 to step 145
Are processing substantially similar to steps 110 to 125, respectively.

Therefore, when the downlink second initial amplification communication data is received through the reception antenna 21, the reception power level thereof is measured. Further, position information is newly calculated, and TPC data is generated based on the received power level.
The modulator 26 generates the communication data shown in FIG. 3C (hereinafter referred to as upstream communication data). However, instead of the received power level, the SIR value is adopted and
TPC data may be generated according to the value.

Next, the gain (hereinafter referred to as "uplink gain") is
The power amplification amplifier 27 is set, and the power amplification amplifier 27 is controlled so that the upstream communication data is power-amplified by the upstream gain.

As a result, the power amplification amplifier 27 outputs the upstream amplified communication data at the upstream transmission power value,
The transmitting antenna 28 transmits the uplink amplified communication data using electromagnetic waves as a medium. It should be noted that the processing for calculating the upstream gain (steps 136 to 144) is performed by the above-described step 1
Since it is the same as 16 to step 125, its description is omitted.

Next, the control unit 13 in the base station 10
The processing of steps 230 to 245 is executed as follows. Here, steps 230 to 245 are substantially the same processes as steps 110 to 125, respectively.

Therefore, when the uplink amplified communication data is received through the receiving antenna 11, the reception power level of the uplink amplified communication data is measured. Further, the demodulation unit 12 causes the position information of the mobile station 20 to be extracted from the uplink amplified communication data. Then, the maximum transmission power value corresponding to the extracted position information is stored in the database 14a as described later.
Select from. Then, TPC data is generated based on the measured received power level. However, instead of the reception power level, the SIR value may be adopted and the TPC data may be generated according to the SIR value.

Next, the modulator 15 combines the maximum transmission power value and TPC data with the communication information as shown in FIG. 3B to generate downlink communication data. After that, the downlink gain is changed to the power amplification amplifier 16
And the power amplification amplifier 16 is controlled so that the downlink communication data is power-amplified by the downlink gain.

As a result, the power amplification amplifier 16 outputs the downlink amplified communication data at the downlink transmission power value, so that the transmitting antenna 17 transmits the downlink amplified communication data. Note that the downlink gain calculation process (steps 237 to 2)
Since step 45) is the same as steps 217 to 225, its description is omitted.

The downlink amplified communication data thus transmitted is received by the processing of step 130 in the control unit 24 of the mobile station 20, and the processing of steps 131 to 145 is performed. Therefore, as in the above, the uplink amplified communication data is transmitted. Along with this, the transmitted uplink amplified communication data is received by the process in the control unit 13 of the base station 10, and the processes of steps 231 to 245 are performed. Therefore, steps 130 to 1 in the mobile station 20
45 and steps 230 to 2 in the base station 10.
45 and so on are repeated alternately.

By the way, in the control unit 13 of the base station 10 and the control unit 24 of the mobile station 20, steps 113 and 21 are executed.
The TPC data generation processings 4, 133, and 234 are substantially the same, and the details of the TPC data generation processing in step 214 will be described below. First, the control unit 13 follows the flowchart shown in FIG.
The C data generation process is executed.

That is, the received power level measured in step 221 (hereinafter referred to as the measured received power level)
, Is determined to match the reference power value (step 250). When it is determined that the measured received power level does not match the reference power value, the process proceeds to step 251, and it is determined whether the measured received power level is higher than the reference power value (step 251). .

If it is determined that the measured received power level is higher than the reference power value, step 25
Proceed to 2 to generate TPC data. In this TPC data TPC data, the base station 10 instructs the mobile station to increase the transmission power.

If it is determined in step 251 that the measured reception power level is less than the reference power value,
Proceeding to step 253, TPC data is generated. In this TPC data, the base station 10 instructs the mobile station to reduce the transmission power.

Furthermore, when it is determined in step 250 that the measured reception power level matches the reference power value, the flow proceeds to step 254, and TPC data is generated. In this TPC data, the base station 10 instructs the mobile station to keep the transmission power constant.

Here, in the control unit 13 of the base station 10, the maximum value calculation processing in steps 203, 213 and 233 is substantially the same, and the details of the maximum value calculation processing in step 213 will be described.

First, the control unit 13 in the base station 10
The maximum value calculation process is executed according to the flowchart shown in FIG.

That is, whether or not the position information extracted in step 212 of this time (hereinafter referred to as position information of this time) matches the position information extracted in step 232 of last time (hereinafter, position information of last time). Is determined (step 26
0).

If the current position information does not match the previous position information, the process proceeds to step 261, and the database 14a is referenced to select the maximum transmission power value corresponding to the current position information (step 261). , 262). Also, when the current location information matches the previous location information,
In step 263, the same value as the previous position information is set as the current position information.

The features of this embodiment will be described below. First, the position information of the mobile station 20 is obtained, and when this position information is sent to the base station 10, the maximum transmission power value is obtained according to this position information. This maximum transmission power value is instructed to the mobile station 20 by the base station 10. As a result, the mobile station 20 is instructed by the base station 10 to have a suitable maximum transmission power value, and the mobile station can transmit to the base station at a transmission power value equal to or lower than the maximum transmission power value. Therefore, when the mobile station communicates with the base station, noise with respect to other mobile stations can be suppressed.

Furthermore, since the base station 10 transmits at a transmission power value less than or equal to the maximum transmission power value, when the base station 10 communicates with a mobile station, noise with respect to other mobile stations can be suppressed.

Further, in implementing the present invention, the maximum transmission power value stored in the database 14a may be updated as follows.

First, in the control unit 24 of the mobile station 20,
As shown in FIG. 3D, the uplink transmission power value (MS) is set to T
The upstream communication data is generated in combination with the PC data and the position information, and the upstream communication data is power-amplified,
This uplink amplified communication data is transmitted from the antenna 28.

Then, the control section 13 of the base station 10 receives the uplink amplified communication data (step 230).
Then, the reception power level of the uplink amplified communication data is measured, and it is determined whether the measured reception power level is higher than a predetermined value (step 270).

When it is determined that the measured received power level is higher than the predetermined value, the database 14a
Is permitted and the process proceeds to step 271. This allows
While extracting position information from the upstream amplified communication data,
An uplink transmission power value is extracted from the uplink amplified communication data, and a new maximum transmission power value is calculated based on the extracted uplink transmission power value.

Specifically, the maximum transmission power value (hereinafter referred to as the corresponding maximum transmission power value) corresponding to the extracted position information is called from the database 14a.

Also, the upstream transmission power value (MS) is multiplied by, for example, 1.1, and the average value of this multiplication value (MS × 1.1) and the corresponding maximum transmission power value is calculated. The average value is determined as a new maximum transmission power value, and the database 14a is updated with this new maximum transmission power value (step 272). Also, in step 270,
When it is determined that the measured reception power level is smaller than the predetermined value, updating of the database 14a is prohibited.

Further, in the above embodiment, an example of updating the database 14a so as to increase the maximum transmission power value has been described, but the present invention is not limited to this, and the maximum transmission power value may be updated so as to decrease.

That is, in updating to increase the maximum transmission power value as described above, a threshold value smaller than the predetermined value used for comparison with the measured reception power level (hereinafter referred to as a low threshold value) is adopted, When the measured reception power level is smaller than the low threshold value, the update of the database 14a is permitted, the position information is extracted from the uplink amplified communication data, and the uplink transmission power value is extracted from the uplink amplified communication data.

Further, the corresponding maximum transmission power value corresponding to the extracted position information is called from the database 14a. Then, the extracted upstream transmission power value is multiplied by, for example, 0.8, and the average value of this multiplication value (MS × 0.8) and the corresponding maximum transmission power value is calculated. The average value is determined as a new maximum transmission power value, and the database 14a is updated with this new maximum transmission power value.
Further, when the measured reception power level is equal to or higher than the low threshold value and lower than the predetermined value, the update of the database 14a is prohibited.

In the above embodiment, an example in which the reception power level is adopted as the reception level in generating the TPC data has been described, but the present invention is not limited to this, and, for example, uplink communication data (or downlink communication data). Etc.) SIR
(Signal-interference-Rati
o) The value may be measured and TPC data may be generated based on this SIR value.

Further, in the above embodiment, the program that achieves the above-mentioned function may be downloaded from the server to the mobile station and installed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a wireless communication system of the present invention.

FIG. 2 is a block diagram showing an electric circuit configuration of a base station and a mobile station shown in FIG.

FIG. 3 is a diagram showing a format of communication data.

FIG. 4 is a flowchart showing a part of the operation of the base station and the mobile station shown in FIG.

5 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG. 1. FIG.

FIG. 6 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG.

FIG. 7 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG.

FIG. 8 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG.

9 is a flowchart showing the rest of the operation of the base station and mobile station shown in FIG.

10 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG.

11 is a flowchart showing the rest of the operation of the base station and the mobile station shown in FIG.

FIG. 12 is a flowchart showing operations of a base station and a mobile station in a modified example.

[Explanation of symbols]

10 ... Base station, 20 ... Mobile station.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5K060 BB08 CC04 CC11 CC12 EE05                       KK01 LL01 LL25                 5K067 AA03 DD20 DD27 EE02 EE10                       GG08 HH21 HH23 JJ52 JJ54

Claims (12)

[Claims] 1. A wireless communication system configured such that a base station and a mobile terminal communicate with each other, wherein the mobile station calculates a position information of the mobile station itself.
0, 112, 132), mobile station transmitting means (27, 28) for transmitting uplink transmission information to the base station, and controlling the mobile station transmitting means for transmitting the position information as the uplink transmission information. Mobile station transmission control means (102, 115, 135), and the base station receives the position information as the uplink transmission information (200, 210, 230) and the position information. Base station calculation means (203, 213, 233) for calculating the maximum transmission power value of the mobile station according to the base station, and base station instruction means (206, 216, 236) for instructing the mobile station of the maximum transmission power value. A wireless communication system comprising: 2. The base station includes base station transmitting means (16, 17) for transmitting downlink transmission information to the mobile station, and the base station instructing means sets the maximum transmission power value to the downlink transmission information. The wireless communication system according to claim 1, wherein the base station transmitting means is controlled so as to be transmitted as. 3. The base station transmitting means controls the base station transmitting means so as to transmit the downlink transmission information at a transmission power value less than or equal to the maximum transmission power value. 2. The wireless communication system according to 2. 4. The mobile station adds a predetermined value to a previous transmission power value of the uplink transmission information to obtain an uplink addition power value, and whether the uplink addition power value is greater than or equal to the maximum transmission power value. When the mobile station determination means (121, 141) for determining whether or not the mobile station determination means determines that the uplink added power value is less than the maximum transmission power value, the transmission power of the uplink transmission information. When the first mobile station setting means (122, 142) for increasing the value and the mobile station determination means determine that the uplink addition power value is equal to or more than the maximum transmission power value, the uplink The wireless communication system according to any one of claims 1 to 3, further comprising: second setting means (124, 143) for setting an increase in the transmission power value of the transmission information. . 5. The base station adds a predetermined value to a previous transmission power value of the downlink transmission information to obtain a downlink addition power value, and whether the downlink addition power value is equal to or more than the maximum transmission power value. When the base station determination means (221, 241) for determining whether or not the base station determination means determines that the downlink added power value is less than the maximum transmission power value, the transmission power of the downlink transmission information When the first base station setting means (222, 242) for setting the value to increase and the base station determining means determine that the downlink addition power value is equal to or more than the maximum transmission power value, the downlink The second base station setting means (224, 243) for setting so as to prohibit an increase in the transmission power value of the transmission information, and the radio according to any one of claims 1 to 4. Communications system. 6. The base station includes a storage unit (14a) for storing a maximum transmission power value of the mobile station for each preset position information, and the base station calculation unit includes the stored position. The maximum transmission power value corresponding to the received position information is selected from among the maximum transmission power values for each piece of information.
6. The wireless communication system according to any one of 5 to 5. 7. The mobile station transmission control means controls the mobile station transmission means so as to transmit the transmission power value of the uplink transmission information as the uplink transmission information, and the base station reception means sets the uplink transmission information. An update that receives a transmission power value of information as the uplink transmission information, and the base station updates the maximum transmission power value of each of the stored position information according to the transmission power value of the received uplink transmission information. 7. A wireless communication system according to claim 6, characterized in that it comprises means (272). 8. The base station receives and measures base station receiving and measuring means (201, 211) for measuring the reception level of the uplink transmission information, and whether or not the measured reception level of the uplink transmission information is equal to or more than a predetermined threshold value. And a level determination unit (270) for determining whether the maximum transmission power value is updated by the update unit when the level determination unit determines that the reception level of the uplink transmission information is equal to or higher than a predetermined threshold value. However, when the level determination means determines that the reception level of the uplink transmission information is less than a predetermined threshold value, the updating of the maximum transmission power value by the updating means is prohibited. The wireless communication system according to claim 7. 9. A method of communicating with a base station for communicating with a mobile station, the method comprising: receiving position information of the mobile station (200, 2).
10, 230), calculating the maximum transmission power value of the mobile station according to the position information (203, 213, 233), and instructing the mobile station of the maximum transmission power value (206, 216). 236), and a base station communication method. 10. A mobile station that communicates with a base station, the calculating means (100, 1) for calculating position information of the mobile station itself.
12, 132) and a transmitting means (27, 2) for transmitting transmission information to the base station.
8), and transmission control means (102, 115, for controlling the transmission means so as to transmit the position information as the transmission information).
135) and receiving means (110, 130) for receiving the maximum transmission power value corresponding to the position information as an instruction from the base station. 11. A computer of a mobile station having a transmitting means for transmitting transmission information to a base station, means for calculating position information of the mobile station itself, and the transmitting means for transmitting the position information as the transmission information. And a program that functions as a unit that controls the maximum transmission power value corresponding to the position information as an instruction from the base station. 12. A computer of a base station having a transmitting means for transmitting transmission information to a mobile station, means for calculating position information of the base station itself, and the transmitting means for transmitting the position information as the transmission information. And a program that functions as a unit that controls the maximum transmission power value corresponding to the position information as an instruction from the mobile station.