JP2004112624A - Base station equipment, higher-rank station equipment, and method of setting transmission power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set the optimum transmission power of a high-speed packet transmission channel, taking the moving speed of a communication terminal unit into consideration. <P>SOLUTION: A moving speed detecting circuit 106 detects the moving speed of the communication terminal unit, by using the output signal of a reverse spread circuit 104. An A-DPCH power setting circuit 107 sets the transmission power of an A-DPCH, based on a TPC command outputted from the reverse spread circuit 104 by controlling a mean time x, based on the moving speed. A power offset deciding circuit 201 decides on a power offset value α of packet transmission data from the amount of transferred data, by controlling the value α based on the moving speed. A DSCH power setting circuit 108 sets the transmission power of a DSCH, adding the power offset value α to the transmission power of the A-DPCH, by controlling the reflecton time z, based on the moving speed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a base station device, a higher station device, and a transmission power value setting method used in a wireless communication system that performs packet transmission.
[0002]
[Prior art]
In the field of wireless communication, a downlink high-speed packet transmission scheme has been developed in which a plurality of communication terminal devices share a high-speed, large-capacity downlink channel and perform packet transmission. One channel for transmitting a packet exists for each sector, and one channel is shared by all communication terminal devices existing in the sector. Therefore, code resources can be effectively used, and transmission power control can be applied. Efficient transmission is possible.
[0003]
Hereinafter, transmission of a Downlink Shared Channel (DSCH), which is one of the downlink high-speed packet transmission systems, will be described. In the DSCH, an A-DPCH (Associated Dedicated Physical Channel) attached to each communication terminal device is provided. The A-DPCH is always connected to the line, and its channel configuration, handover control, and the like are the same as those of a normal DPCH (Dedicated Physical Channel).
[0004]
The transmission power of the A-DPCH is controlled by a generally well-known closed-loop transmission power control method so that the reception SIR of the A-DPCH becomes the target SIR. Since the required SIR of the DSCH is different from the target SIR of the A-DPCH, the transmission power of the DSCH is set by adding a power offset to the transmission power of the A-DPCH. The power offset value is controlled according to the amount of transfer data.
[0005]
FIG. 4 is a diagram for explaining the average of the transmission power of the A-DPCH and the timing of the power offset control of the DSCH. In FIG. 4, “x” indicates a time (average time) measured for calculating the average value of the transmission power of the A-DPCH, and “z” indicates the transmission power value of the DSCH and the average value of the transmission power of the A-DPCH. Is reflected (reflection time), and “y” indicates a control delay until the calculated average value of the transmission power of the A-DPCH is reflected on the transmission power value of the DSCH. Note that the control delay is a delay time generated between the base station apparatus and the upper station apparatus when the power offset value is determined by the upper station apparatus. Further, a cycle (report cycle) for reporting the average transmission power of the A-DPCH to the DSCH is the same as the reflection time z.
[0006]
The average transmission power of the A-DPCH is the average of the transmission power of the A-DPCH at the average time x immediately before the reporting timing for each reflection time z, and its value does not change until it is updated at the next reporting timing. However, the timing at which the average transmission power of the A-DPCH is actually reflected in the transmission power value of the DSCH is shifted backward from the reporting timing by the control delay y.
[0007]
Here, in the conventional method of setting the transmission power value of the DSCH, the average time x and the reflection time z are fixed, and the power offset value α is controlled based only on the transfer data amount.
[0008]
[Non-patent document 1]
"" Doppler frequency detection using pilot symbols, "IEICE General Conference, 2000, B-5-59"
[0009]
[Problems to be solved by the invention]
However, when the moving speed of the communication terminal device is fast, the temporal change of the transmission power is large, and when the transmission power value of the high-speed packet transmission channel is set by the conventional method, a desired SIR cannot be obtained in the communication terminal device. There is a possibility that the number of packet retransmissions increases and the throughput of the entire system decreases.
[0010]
The present invention has been made in view of such a point, and a base capable of setting an optimal transmission power value of a high-speed packet transmission channel in consideration of a moving speed of a communication terminal device or a temporal change of a transmission power value. It is an object of the present invention to provide a station device, an upper station device, and a transmission power value setting method.
[0011]
[Means for Solving the Problems]
A base station apparatus according to the present invention includes: a moving speed detecting unit that detects a moving speed of a communication terminal device; and a first transmission power setting that sets a transmission power of a first channel based on a TPC command transmitted from the communication terminal device. Means for controlling the time for reflecting the transmission power of the first channel according to the moving speed, and setting the transmission power of the second channel by offsetting the transmission power of the first channel. And a setting means.
[0012]
The second transmission power setting means in the base station apparatus of the present invention employs a configuration in which the higher the moving speed of the communication terminal device, the shorter the time for reflecting the transmission power of the first channel.
[0013]
According to these configurations, the reflection time, which is a parameter of the power offset control, can be controlled according to the moving speed of the communication terminal device. Therefore, the transmission power value of the second high-speed packet transmission channel is optimally set. can do.
[0014]
The first transmission power setting means in the base station apparatus of the present invention employs a configuration in which the time for averaging the measured transmission power of the first channel is controlled according to the moving speed.
[0015]
The first transmission power setting means in the base station apparatus of the present invention employs a configuration in which the higher the moving speed of the communication terminal device, the shorter the time for averaging the transmission power of the first channel.
[0016]
According to these configurations, it is possible to control the time for averaging the transmission power of the first channel, which is a parameter of the power offset control, according to the moving speed of the communication terminal apparatus. It can be set optimally.
[0017]
An upper station apparatus of the present invention determines a power offset value according to a transfer data amount and a moving speed of packet transmission data in a base station apparatus, and determines the determined power offset value as a second transmission power of any one of the base station apparatuses. A configuration including a power offset determining means for outputting to the setting means is employed.
[0018]
The power offset determining means in the higher station apparatus of the present invention employs a configuration in which the higher the moving speed of the communication terminal device, the higher the power offset value.
[0019]
According to these configurations, it is possible to detect the moving speed of the communication terminal apparatus and control the power offset value, which is a parameter of the power offset control, according to the detection result, so that the transmission power value of the second channel is optimized. Can be set to
[0020]
The base station apparatus of the present invention includes a power offset determining unit that determines a power offset value according to a transfer data amount and a moving speed of packet transmission data, and outputs the determined power offset value to the second transmission power setting unit. Take the configuration.
[0021]
The power offset determining means in the base station apparatus of the present invention employs a configuration in which the higher the moving speed of the communication terminal device, the higher the power offset value.
[0022]
According to these configurations, the base station apparatus can also detect the moving speed of the communication terminal apparatus and control the power offset value, which is a parameter of the power offset control, according to the detection result. The transmission power value can be set optimally.
[0023]
The base station apparatus according to the present invention includes: a power distribution fluctuation amount detection unit configured to measure a reception power for a predetermined time to detect a temporal change in transmission power; and a first channel based on a TPC command transmitted from the communication terminal apparatus. First transmission power setting means for setting transmission power; controlling transmission power of the first channel in accordance with a temporal change in the transmission power; adding an offset to the transmission power of the first channel; And a second transmission power setting means for setting the transmission power of the second transmission power.
[0024]
According to this configuration, the reflection time, which is a parameter of the power offset control, can be controlled in accordance with the temporal change of the transmission power, so that the transmission power value of the second channel, which is the high-speed packet transmission channel, is optimally set. be able to.
[0025]
The first transmission power setting means in the base station apparatus of the present invention employs a configuration in which the time for averaging the measured transmission power of the first channel is controlled according to a temporal change in the transmission power.
[0026]
According to this configuration, the averaging time of the transmission power of the first channel, which is a parameter of the power offset control, can be controlled according to the temporal change of the transmission power of the communication terminal apparatus. The power value can be set optimally.
[0027]
An upper station apparatus of the present invention determines a power offset value according to a temporal change in a transfer data amount and transmission power of packet transmission data, and determines the determined power offset value as a second transmission power of any one of the base station apparatuses. A configuration including a power offset determining means for outputting to the setting means is employed.
[0028]
The base station apparatus according to the present invention determines a power offset value according to a temporal change in a transfer data amount of packet transmission data and transmission power, and outputs the determined power offset value to a second transmission power setting unit. A configuration having means is adopted.
[0029]
According to these configurations, it is possible to detect a temporal change in transmission power and control the power offset value, which is a parameter of power offset control, according to the detection result, so that the transmission power value of the second channel is optimized. Can be set to
[0030]
A transmission power value setting method according to the present invention comprises the steps of: setting a transmission power of a first channel based on a TPC command transmitted from a communication terminal device; detecting a moving speed of the communication terminal device; Setting the power offset value according to the transfer data amount and the moving speed of the first channel, and setting the transmission power of the first channel by adding the power offset value to the transmission power of the first channel. Take the method.
[0031]
According to this method, the moving speed of the communication terminal apparatus can be detected, and power offset control can be performed in accordance with the detection result, so that the transmission power value of the second channel can be optimally set.
[0032]
The transmission power value setting method of the present invention employs a method of controlling the time for reflecting the transmission power of the first channel on the transmission power of the second channel according to the moving speed.
[0033]
According to this method, the reflection time, which is a parameter of the power offset control, can be controlled according to the moving speed of the communication terminal device, so that the transmission power value of the second channel can be optimally set.
[0034]
The transmission power value setting method of the present invention employs a method of controlling the time for averaging the measured transmission power of the first channel according to the moving speed.
[0035]
According to this method, the average time, which is a parameter of the power offset control, can be controlled according to the moving speed of the communication terminal device, so that the transmission power value of the second channel can be optimally set.
[0036]
A transmission power value setting method according to the present invention includes the steps of: setting a transmission power of a first channel based on a TPC command transmitted from a communication terminal device; and detecting a temporal change in the transmission power of the communication terminal device. Setting a power offset value according to a temporal change in the transfer data amount and transmission power of packet transmission data; and adding the power offset value to the transmission power of the first channel to reduce the transmission power of the first channel. Setting step.
[0037]
According to this method, a temporal change in the transmission power can be detected, and power offset control can be performed according to the detection result, so that the transmission power value of the second channel can be optimally set.
[0038]
BEST MODE FOR CARRYING OUT THE INVENTION
The gist of the present invention is to detect the moving speed of the communication terminal device and control parameters (average time x, reflection time z, power offset value α) of power offset control according to the detection result.
[0039]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, DSCH is used for packet transmission.
[0040]
(Embodiment)
FIG. 1 is a block diagram showing a configuration of a base station apparatus and a higher station apparatus according to one embodiment of the present invention. In FIG. 1, the base station apparatus includes an antenna 101, a duplexer 102, a radio receiving circuit 103, a despreading circuit 104, a demodulation circuit 105, a moving speed detection circuit 106, an A-DPCH power setting circuit 107, , DSCH power setting circuit 108. Further, the base station device includes a modulation circuit 151, a spreading circuit 152, a radio transmission circuit 153, a modulation circuit 154, a spreading circuit 155, and a radio transmission circuit 156. Further, the higher station apparatus includes a power offset determination circuit 201.
[0041]
Duplexer 102 outputs a signal received by antenna 101 to wireless reception circuit 103. The duplexer 102 wirelessly transmits the signals output from the wireless transmission circuits 153 and 156 from the antenna 101.
[0042]
Radio receiving circuit 103 converts the radio frequency received signal output from duplexer 102 into a baseband digital signal and outputs the signal to despreading circuit 104.
[0043]
The despreading circuit 104 performs despreading processing on the received baseband signal, outputs the despread data portion signal to the demodulation circuit 105, and outputs the despread control portion signal to the moving speed detection circuit 106 and Output to the A-DPCH power setting circuit 107.
[0044]
The demodulation circuit 105 performs demodulation processing on the signal after despreading, extracts received data, and outputs the received data to the higher station apparatus.
[0045]
The moving speed detection circuit 106 detects the moving speed of the communication terminal device from the signal demodulated using the output signal of the despreading circuit 104, and outputs the detection result to the A-DPCH power setting circuit 107, the DSCH power setting circuit 108, and the power offset. Output to the judgment circuit 201. As a method of detecting the moving speed, a method of detecting a Doppler frequency using a pilot symbol and the like are generally known.
[0046]
A-DPCH power setting circuit 107 sets the transmission power of A-DPCH based on the TPC command obtained by demodulating the signal output from despreading circuit 104. At that time, the A-DPCH power setting circuit 107 controls the average time x based on the moving speed. Then, A-DPCH power setting circuit 107 outputs a signal indicating the set transmission power of A-DPCH to DSCH power setting circuit 108, wireless transmission circuit 153, and power offset determination circuit 201.
[0047]
DSCH power setting circuit 108 sets the transmission power of DSCH by adding a power offset value to the transmission power of A-DPCH. At that time, the DSCH power setting circuit 108 controls the reflection time z based on the moving speed. Then, DSCH power setting circuit 108 outputs a signal indicating the set transmission power of DSCH to radio transmission circuit 156.
[0048]
Modulation circuit 151 modulates transmission data input from the higher station apparatus, and outputs a modulated signal to spreading circuit 152. Spreading circuit 152 spreads the output signal of modulation circuit 151 and outputs the spread signal to radio transmitting circuit 153.
[0049]
Radio transmitting circuit 153 amplifies the output signal of spreading circuit 152 to the power set by A-DPCH power setting circuit 107, converts the frequency to a radio frequency, and outputs it to duplexer 102.
[0050]
Modulation circuit 154 modulates the packet transmission data input from the higher station apparatus, and outputs a modulated signal to spreading circuit 155. Spreading circuit 155 spreads the output signal of modulation circuit 154 and outputs the spread signal to radio transmitting circuit 156.
[0051]
Radio transmitting circuit 156 amplifies the output signal of spreading circuit 155 to the power set by DSCH power setting circuit 108, converts the frequency to a radio frequency, and outputs the radio signal to duplexer 102.
[0052]
The power offset determination circuit 201 stores a table indicating the relationship between the transfer data amount of the packet transmission data and the power offset value, and determines the power offset value of the packet transmission data from the transfer data amount. At this time, the power offset determination circuit 201 controls the power offset value α based on the moving speed. Then, power offset determination circuit 201 outputs power offset value α to DSCH power setting circuit 108.
[0053]
As described above, in the present embodiment, the reflection time z, the average time x, and the power offset value α are adaptively controlled according to the moving speed of the communication terminal apparatus, and the DSCH transmission power is set.
[0054]
FIG. 2 is a block diagram showing a configuration of a communication terminal device that performs wireless communication with the base station device shown in FIG. 2, the communication terminal apparatus includes an antenna 301, a duplexer 302, a radio reception circuit 303, a despreading circuit 304, a demodulation circuit 305, a SIR measurement circuit 306, a TPC generation circuit 307, a radio reception circuit 308, a despreading circuit 309, and a demodulation circuit 310. Further, the communication terminal device includes a modulation circuit 351, a spreading circuit 352, and a radio transmission circuit 353.
[0055]
The duplexer 302 outputs a signal received by the antenna 301 to the wireless receiving circuit 303 and the wireless receiving circuit 308. Further, duplexer 302 wirelessly transmits the signal output from wireless transmission circuit 353 from antenna 301.
[0056]
Radio receiving circuit 303 converts the radio frequency received signal output from duplexer 302 into a baseband digital signal and outputs the signal to despreading circuit 304.
[0057]
The despreading circuit 304 performs despreading processing on the received baseband signal, outputs a signal of the data portion after despreading to the demodulation circuit 305, and outputs the desired wave power and the interference wave measured in the despreading process. The power is output to the SIR measurement circuit 306.
[0058]
Demodulation circuit 305 performs demodulation processing on the despread signal to extract received data.
[0059]
The SIR measurement circuit 306 measures the downlink reception SIR based on the desired wave power and the interference wave power, and outputs the measured reception SIR to the TPC generation circuit 307.
[0060]
The TPC generation circuit 307 generates a downlink TPC command according to the magnitude relationship between the reception SIR and the target SIR, and outputs the TPC command to the modulation circuit 351.
[0061]
The radio receiving circuit 308 converts the radio frequency packet signal output from the duplexer 302 into a baseband digital signal and outputs it to the despreading circuit 309.
[0062]
The despreading circuit 309 performs despreading processing on the baseband packet signal and outputs the result to the demodulation circuit 310.
[0063]
Demodulation circuit 310 performs demodulation processing on the despread packet signal to extract packet reception data.
[0064]
The modulation circuit 351 modulates the transmission data and the TPC command, and outputs a modulated signal to the spreading circuit 352. Spreading circuit 352 spreads the output signal of modulation circuit 351 and outputs the spread signal to radio transmitting circuit 353.
[0065]
Radio transmitting circuit 353 converts the output signal of spreading circuit 352 into a radio frequency and outputs the signal to duplexer 302.
[0066]
Hereinafter, the relationship between the moving speed of the communication terminal device and (1) average time x, (2) reflection time z, and (3) power offset value α will be considered.
[0067]
(1) Average time x
When the moving speed is low, the temporal change of the transmission power is small. Therefore, by increasing the measurement time, the fluctuation of the instantaneous value such as noise can be converged, and the reliability can be improved. On the other hand, when the moving speed is high, the temporal change of the transmission power is large. Therefore, unless the measurement time is shortened, it may not be possible to cope with the ever-changing propagation environment (situation).
[0068]
Therefore, the A-DPCH power setting circuit 107 controls the average time x to be shorter as the moving speed is higher.
[0069]
(2) Reflection time z (= report cycle)
When the moving speed is low, the temporal change of the transmission power is small. Therefore, even if the report cycle is lengthened, the propagation state does not change much, and the transmission power of the DSCH that can obtain a desired reception SIR in the communication terminal device is reduced. This can be set, and the control load reflected as a system can be reduced by lengthening the reporting cycle. On the other hand, when the moving speed is high, the temporal change of the transmission power is large. Therefore, unless the reporting cycle is shortened, the past power offset value is set, and the accuracy of the DSCH transmission power value is deteriorated. There is a risk.
[0070]
Therefore, the DSCH power setting circuit 108 controls the reflection time z to be shorter as the moving speed is faster.
[0071]
(3) Power offset value α
When the moving speed is low, the temporal change of the transmission power is small, so that although the transmission power of the DSCH is sufficient for the required power and a sufficient reception rate can be obtained, excess power may be used. On the other hand, when the moving speed is high, the transmission power of the DSCH is largely changed over time, so that the transmission power of the DSCH may not be sufficient for the required power, and the reception rate may be reduced.
[0072]
Therefore, the power offset determination circuit 201 controls the power offset value to increase as the moving speed increases.
[0073]
FIG. 3 is a diagram showing an example of a table stored in the power offset determination circuit 201. This table shows a list of DSCH setting parameters. In the case of FIG. 3, when determining the power offset value, the power offset determination circuit 201 determines the moving speed for the combination of the transfer data amount [bits]: [0, 0, 336, 672, 1344, 3024, 6048]. Is low, a combination of power offset values A [dB]: [0, 3, 6, 9, 12, 15, 18] is used, and when the moving speed is high, power offset values B [dB]: [2] , 5, 8, 11, 14, 17, 20].
[0074]
Other methods of switching the power offset value include a method of storing one set of power offset values and adding a fixed amount (for example, 2 [dB]) when the moving speed is high, a method of weighting addition, and the like. Can be
[0075]
Although a case has been described with the present embodiment where a power offset value is set in a higher station apparatus, the present invention is not limited to this, and a power offset value may be set in a base station apparatus. In this case, in FIG. 1, a power offset determination circuit 201 is provided in the base station apparatus.
[0076]
In the present embodiment, the switching timing of each parameter may be the same or different. In addition, the number of steps for switching each parameter may be several (for example, three steps of low, medium, and high moving speeds), or may be finer.
[0077]
Further, in the present embodiment, DSCH has been described as an example of packet transmission, but the present invention is not limited to this, and the present invention is also applicable to other systems related to power offset control such as a shared control channel of HSDPA (High Speed Downlink Packet Access). Can be adapted.
[0078]
Further, in the present embodiment, a case has been described in which the moving speed is correlated with the temporal change of the transmission power, and the case where each parameter is controlled based on the moving speed has been described. However, the present invention is not limited to this. May be measured for a predetermined time to detect a temporal change in transmission power, and each parameter may be controlled based on the temporal change in transmission power. In this case, instead of the moving speed detection circuit 106 in FIG. 1, a power distribution fluctuation amount detection circuit that measures reception power for a predetermined time and detects a temporal change in transmission power is added.
[0079]
In the present embodiment, the statistical value of the moving speed calculated in advance may be used as the default value that is set assuming that the switching determination cannot be performed until the moving speed is detected.
[0080]
【The invention's effect】
As described above, according to the present invention, a temporal change in the moving speed or the transmission power value of the communication terminal device is detected, and the power offset control parameters (average time x, reflection time z , Power offset value α), it is possible to set an optimal DSCH transmission power value.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a base station apparatus and a higher station apparatus according to an embodiment of the present invention; FIG. 2 shows a configuration of a communication terminal apparatus which performs wireless communication with the base station apparatus shown in FIG. FIG. 3 is a diagram illustrating an example of a table stored inside a power offset determination circuit of the base station apparatus according to the above-mentioned embodiment. FIG. 4 is a diagram illustrating an average of transmission power of A-DPCH and power offset control of DSCH. Diagram for explaining timing [Explanation of reference numerals]
106 Moving speed detection circuit 107 A-DPCH power setting circuit 108 DSCH power setting circuit 153, 156 Wireless transmission circuit 201 Power offset determination circuit

Claims (16)

Moving speed detecting means for detecting the moving speed of the communication terminal device, first transmission power setting means for setting the transmission power of the first channel based on the TPC command transmitted from the communication terminal device, Second transmission power setting means for controlling a time for reflecting transmission power according to the moving speed, setting an offset to the transmission power of the first channel, and setting the transmission power of the second channel. A base station device characterized by the above-mentioned. 2. The base station apparatus according to claim 1, wherein the second transmission power setting means performs control such that the higher the moving speed of the communication terminal apparatus, the shorter the time for reflecting the transmission power of the first channel. The base station apparatus according to claim 1, wherein the first transmission power setting unit controls a time for averaging the measured transmission power of the first channel according to a moving speed. 4. The base station apparatus according to claim 3, wherein the first transmission power setting means performs control such that the averaging time of the transmission power of the first channel becomes shorter as the moving speed of the communication terminal apparatus becomes faster. The power offset value is determined according to the transfer data amount and the moving speed of the packet transmission data, and the determined power offset value is transmitted to the second transmission power setting means of the base station apparatus according to any one of claims 1 to 4. An upper station device comprising a power offset judging means for outputting. 6. The upper station apparatus according to claim 5, wherein the power offset determining means determines a higher power offset value as the moving speed of the communication terminal apparatus is higher. 2. A power offset determining means for determining a power offset value according to a transfer data amount and a moving speed of packet transmission data, and outputting the determined power offset value to a second transmission power setting means. The base station device according to any one of claims 1 to 4. The base station apparatus according to claim 7, wherein the power offset determining unit determines the power offset value to be higher as the moving speed of the communication terminal apparatus is higher. Power distribution fluctuation amount detecting means for measuring reception power for a predetermined time and detecting a temporal change in transmission power, and a first transmission for setting transmission power of a first channel based on a TPC command transmitted from the communication terminal apparatus Power setting means for controlling the transmission power of the first channel in accordance with a temporal change in the transmission power, and setting the transmission power of the second channel by offsetting the transmission power of the first channel; And a transmission power setting unit. The base station apparatus according to claim 9, wherein the first transmission power setting means controls a time for averaging the measured transmission power of the first channel according to a temporal change of the transmission power. The power offset value is determined according to a temporal change in the transfer data amount and the transmission power of the packet transmission data, and the determined power offset value is transmitted to the second transmission power setting means of the base station apparatus according to claim 9 or 10. An upper station device comprising a power offset judging means for outputting. Power offset determining means for determining a power offset value according to a temporal change in the transfer data amount and transmission power of the packet transmission data, and outputting the determined power offset value to the second transmission power setting means. The base station apparatus according to claim 9 or claim 10, wherein Setting the transmission power of the first channel based on the TPC command transmitted from the communication terminal device, detecting the moving speed of the communication terminal device, according to the transfer data amount and the moving speed of the packet transmission data. Setting a power offset value; and adding the power offset value to the transmission power of the first channel to set the transmission power of the first channel. . 14. The transmission power value setting method according to claim 13, wherein a time for reflecting the transmission power of the first channel on the transmission power of the second channel is controlled according to the moving speed. 15. The transmission power value setting method according to claim 13, wherein a time for averaging the measured transmission power of the first channel is controlled according to a moving speed. Setting the transmission power of the first channel based on the TPC command transmitted from the communication terminal device; detecting a temporal change in the transmission power of the communication terminal device; Setting a power offset value according to a temporal change in power, and setting a transmission power of the first channel by adding the power offset value to the transmission power of the first channel. Characteristic transmission power value setting method.

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