JP5341361B2 - Communication apparatus and transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus or a transmission method which is capable of setting transmission power to a target value and maintaining it in the case that a modulation system employs OFDMA. <P>SOLUTION: In the communication apparatus of a base station performing wireless communication with the communication device of a terminal or the transmission method thereof, a sub-frame to which the use area of down link burst is assigned on the frequency axis/time axis is generated, and a transmission signal based on the sub-frame is output to the communication apparatus of the terminal and is amplified, and transmission power based on an output after amplification is detected. The target value of transmission power is determined on the basis of assignment of the down link burst, and the output is controlled so that the transmission power detected at that point of time lies within a range from the upper limit value to the lower limit value of the target value. The similar control is possible with the communication device of the terminal or the transmission method thereof. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to TDD (Time Division Duplexing) wireless communication employing OFDMA (Orthogonal Frequency Division Multiple Access) as a modulation scheme.

  OFDMA is adopted in WiMAX, which is one of the next generation wireless communication standards (see Non-Patent Document 1). For example, for transmission / reception between a base station communication apparatus and a plurality of terminals, time-division wireless communication employing OFDMA as a modulation method can be performed. In this case, the downlink from the communication device of the base station to the terminal and the uplink from the terminal to the communication device are performed alternately. The downlink downlink subframe is divided into downlink bursts addressed to each terminal on the time axis and multiplexed, and is also divided and multiplexed into logical subchannels on the frequency axis (Non-Patent Document 2). reference.).

IEEE standard, 802.16 Revised Wireless Broadband Textbook, High Speed IP Wireless, Chapter 5, Issued on June 21, 2006, Impress R & D Inc.

  In the OFDMA communication system as described above, if the transmission power at the time of transmission from the communication device of the base station is excessive as compared with an appropriate value, there is a problem that the reception level at the terminal becomes excessive, and other It is not preferable because it will affect the radio waves. On the other hand, if the transmission power becomes too low, the terminal cannot receive well. Therefore, the transmission power must be set and maintained at an appropriate target value. In order to set and maintain the transmission power at the target value, it is conceivable to perform the feedback control by detecting the transmission power in the communication apparatus.

  However, in the downlink subframe as described above, the number of terminals serving as communication partners changes from moment to moment, and the number of subchannel allocations on the frequency axis of the frame changes, so the transmission power also changes accordingly. Even if the number of terminals does not change, the transmission power similarly changes when the amount of information assigned to one terminal changes. Therefore, even if transmission power is detected inside the communication apparatus, it is difficult to determine whether or not the detected transmission power is appropriate.

  On the other hand, since the transmission power also changes when the amount of information allocated at the time of transmission changes on the terminal side, even if the transmission power is detected inside the communication device of the terminal, it is determined whether the detected transmission power is appropriate. It is difficult to do.

  In view of such a problem, an object of the present invention is to provide a communication device or a transmission method capable of setting and maintaining transmission power as a target value when the modulation scheme is OFDMA.

The present invention is a communication device of a base station that performs radio communication with a communication device of one or a plurality of terminals, and the downlink sub-channel in which information is multiplexed on a time axis and a frequency axis with respect to the communication device of the terminal Based on a communication unit that generates a frame and outputs a transmission signal based thereon, an amplifier that amplifies the transmission signal, a power detection unit that detects transmission power based on the output of the amplifier, and downlink burst allocation information Te, and give a transmission power according to the number of terminals and information amount in a predetermined time within the downlink sub-frame switching signal was the starting point of the transmission from the receiver, determines the transmission power to the target value of the transmission power, before transmission power detected by the serial power detection unit, in which a control unit for controlling the output of the communication unit so that is maintained at the target value.
In the communication apparatus configured as described above, the transmission power corresponding to the downlink burst allocation is detected, and the output of the communication unit is controlled so that the transmission power becomes a predetermined target value.

On the other hand, the present invention is a communication device of a terminal that performs radio communication with a communication device of a base station, and a communication unit that outputs a transmission signal based on at least a use area of an uplink burst allocated on the frequency axis, and the transmission An amplifier that amplifies the signal, a power detector that detects transmission power based on the output of the amplifier, and an uplink burst in which the switching signal from reception to transmission is based on the use area of the uplink burst. and give a transmission power corresponding to the area of the assigned information at a given time, to determine its transmission power to the target value of the transmission power, the transmission power detected by Oite the power detector to the use region is , in which a control unit for controlling the output of the communication unit so that is maintained at the target value.
In the communication apparatus configured as described above, the transmission power based on the uplink burst usage region is detected, and the output of the communication unit is controlled so that the transmission power becomes a predetermined target value.

Further, in the communication device, the communication unit includes a switching signal generation unit that generates a transmission / reception switching signal, and the control unit starts when the switching signal generation unit outputs a switching signal for starting transmission. The predetermined time can be set as the predetermined time point.
In this case, it is possible to reliably detect the transmission power within the burst time domain.

In the communication apparatus, the power detection unit includes a means for detecting and detecting the output of the amplifier, and the control unit controls the output of the communication unit so that the voltage obtained by the detection falls within a predetermined range. You may do it.
In this case, since the target value can be widened by setting the value within the predetermined range, it is possible to prevent the output control from being performed sensitively.

On the other hand, the present invention is a transmission method in a communication apparatus of a base station that performs radio communication with a communication apparatus of one or a plurality of terminals, and information is multiplexed on a time axis and a frequency axis with respect to the communication apparatus of the terminal. And generating a transmission signal based on this, amplifying the transmission signal, detecting transmission power based on the amplified output, and receiving from the reception based on downlink burst allocation information and to give a transmission power according to the number of terminals and information amount in a predetermined time of the downlink subframe to the switching signal was the starting point of the transmission, and determines its transmission power to the target value of the transmission power, test out transmission power but it is intended to control the output so that is maintained at a predetermined target value.
In the transmission method as described above, the transmission power corresponding to the assignment of the downlink burst is detected, and the output of the communication unit is controlled so that the transmission power becomes a predetermined target value.

Further, the present invention is a transmission method in a communication device of a terminal that performs radio communication with a communication device of a base station, and outputs a transmission signal based on at least an uplink burst usage area allocated on the frequency axis, Amplifying a signal, detecting transmission power based on the output after amplification, and assigning at a predetermined time point in the uplink burst from a switching signal from reception to transmission based on the use area of the uplink burst was to give a transmission power corresponding to the region information, and determines its transmission power to the target value of the transmission power, transmission power detected Te such use area smell, controls the output so that the target value Is.
In the transmission method as described above, the transmission power based on the uplink burst usage region is detected, and the output of the communication unit is controlled so that the transmission power becomes a predetermined target value.

  According to the communication apparatus or the transmission method of the present invention, when the modulation scheme is OFDMA, the transmission power can be set to the target value and maintained.

  Hereinafter, a communication device and a transmission method according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which, for example, a communication device 2 installed in a base station 1 and one or a plurality of (one only shown) terminal-side communication devices 3 having an antenna 301 perform uplink / downlink wireless communication. FIG. TDD is used as the communication method, and OFDMA is used as the modulation method.

  2 shows a base station transmission signal (DL: downlink) transmitted from the communication device 2 of the base station 1, and a terminal transmission signal (UL: up) transmitted from the terminal communication device 3 to the communication device 2 of the base station 1. (Link) and TDD control in the communication apparatus 2 of the base station 1. In the communication device 2, downlink transmission and uplink reception are performed alternately, and a gap RTG for switching from reception to transmission is provided between the uplink and the next downlink. A gap TTG for switching from transmission to reception is provided between the uplink and the uplink. The switching signal is output within the range of these gaps RTG and TTG.

<< Embodiment Regarding Communication Device of Base Station >>
FIG. 3 is a circuit diagram showing the main part of the internal circuit of the communication device 2 in the base station. In the figure, a transmission / reception antenna 201 is connected to a switch 202 (for example, configured using a semiconductor switching element), and one of the two electric circuits Ls and Lr and the antenna 201 are connected. Can be connected. The electric circuit Lr is a receiving electric circuit, and is connected to the radio unit 205 in the communication unit 204 via an amplifier 203 (power amplifier). The wireless unit 205 has a built-in attenuator (attenuator) 206, and can attenuate input and output with a set attenuation rate.

  The output of the wireless unit 205 is given to an amplifier 208 (power amplifier) via an attenuator 206, and the output terminal of the amplifier 208 is connected to a transmission circuit Ls. A directional coupler 209 is provided in the electric circuit Ls, and amplifiers / detectors 210 and 211 are provided on the output side thereof. The directional coupler 209 and the amplifiers / detectors 210 and 211 constitute a power detection unit 212 that detects transmission power based on the output of the amplifier 208 in the form of a detection voltage. The directional coupler 209 outputs the power output from the amplifier 208 to the amplifier / detector 211 side, and outputs the power of the reflected wave from the antenna 201 to the amplifier / detector 210 side. Outputs of the amplifiers / detectors 210 and 211 are converted into digital signals by the A / D converters 213 and 214 and then input to the control unit 215.

  The control unit 215 can control the attenuation rate of the attenuator 206. The communication unit 204 includes a switching signal generation unit 207 in addition to the wireless unit 205. The switching signal generation unit 207 generates a switching signal for switching between transmission / reception and provides it to the control unit 215. In addition, the switching signal generation unit 207 sends a switching signal to the switch 202 to select one of the electric circuits Lr and Ls.

  As described above, the communication device 2 repeats transmission (downlink) and reception (uplink) alternately by TDD control. At the time of reception, the switch 202 has selected the electric circuit Lr, and the transmission signal from the communication device 3 of the terminal is received by the antenna 201, amplified by the amplifier 203, and provided to the wireless unit 205 in the communication unit 204. Is done. On the other hand, at the time of transmission, the switch 202 has selected the electric circuit Ls, and the transmission signal generated by the wireless unit 205 is output via the attenuator 206, amplified by the amplifier 208, and transmitted from the antenna 201. .

  FIG. 4A is a diagram illustrating an example of a downlink subframe in which a signal transmitted from the radio unit 205 is viewed on a time axis versus a frequency axis during transmission from the base station 1 (downlink). The axis represents time and the vertical axis represents frequency. This figure shows a certain downlink subframe and the next downlink subframe. An uplink uplink subframe exists between two downlink subframes, but is omitted here and only the downlink subframe is shown.

  The downlink subframe is composed of a leading preamble, a next DL map (downlink map), and DL bursts (downlink bursts) that are information addressed to each terminal (N units) (N in this example). = 6, and DL bursts are # 1 to # 6). As shown in the figure, DL bursts # 1 to # 6 are assigned to six regions generated by being multiplexed on the time axis and the frequency axis. Information about what to assign to which area is described in the DL map. The DL burst # 1 includes a UL map (uplink map). In the UL map, information on the UL burst area used by each terminal in the uplink is described.

  A transmission signal based on the downlink subframe shown in FIG. 4A is output from radio section 205 (including attenuator 206) in FIG. 3 and amplified by amplifier 208. The power output from the amplifier 208 is detected by the directional coupler 209, detected by the amplifier / detector 211, converted into a detected voltage, converted into a digital signal by the A / D converter 214, and then input to the control unit 215. Is done. Note that the control unit 215 can instruct the A / D converter 214 when to receive the digital signal. Similarly, the power of the reflected wave is detected by the directional coupler 209, detected by the amplifier / detector 210, converted into a detected voltage, converted into a digital signal by the A / D converter 213, and then the control unit 215. Is input. The control unit 215 obtains a detection voltage corresponding to the transmission power based on the two detection voltages. It is also possible to detect an abnormality in the antenna 201 based on the ratio of the two detection voltages.

  FIG. 4B is a graph illustrating transmission power (detection voltage) based on the downlink subframe of FIG. As shown in the figure, the waveform of the transmission power in the time zone corresponding to the downlink subframe reflects the form of the contour line on the frequency axis of the downlink subframe almost as it is. In addition, although it is not a transmission timing between two downstream sub-frames, it has a waveform in which the residual voltage is transiently lowered.

  (C) of FIG. 4 is a time chart which shows the timing which transmits a downlink sub-frame. This signal is output from the switching signal generation unit 207 (FIG. 3), and the rising and falling edges of the signal become a switching signal from reception to transmission and a switching signal from transmission to reception, respectively. As shown in the figure, the timing at which the switching signal is output is slightly different from the start / end timing of the downlink subframe.

  Next, (a) of FIG. 5 is a figure which shows the other example of a downlink sub-frame. Similar to (a) of FIG. 4, this downlink subframe is composed of a leading preamble, a next DL map, and a DL burst that is information addressed to each terminal. Has decreased to M units (M <N). Here, for example, M = 3, and there are three DL bursts # 1 to # 3. As the number of DL bursts is reduced from N to M, the contour line of the subframe on the frequency axis in the DL map and DL burst time zone is lowered from the position of the two-dot chain line to the position of the solid line.

(B) of FIG. 5 is a graph showing transmission power (detection voltage) based on the downlink subframe of (a). As shown in the figure, the waveform of the transmission power in the time zone corresponding to the downlink subframe reflects the form of the contour line on the frequency axis of the downlink subframe almost as it is. Therefore, compared with the case of N units, the DL map and the transmission power in the DL burst time zone for M units are reduced.
FIG. 5C is a time chart showing the timing for transmitting a downlink subframe, similar to that shown in FIG.

  As is apparent from FIGS. 4 and 5, the transmission power varies depending on the allocation of DL bursts. However, information regarding the DL burst usage area is included in the DL map. Therefore, the control unit 215 can acquire the DL map information from the radio unit 205, and can set the configuration time of the use area of any burst within the DL burst time domain as the transmission power detection timing.

For example, since the switching signal from reception to transmission in (c) of FIG. 4 is the starting point, the transmission power at the elapse of a predetermined time Δt corresponds to the signal output of DL bursts # 1 and # 2. The target value of the transmission power can be obtained by calculation. Also, starting from the switching signal from reception to transmission in (c) of FIG. 5, the transmission power at the elapse of the predetermined time Δt corresponds to the signal output of only DL burst # 1, so that Thus, the target value of the transmission power can be obtained.
In this way, the target value of the transmission power to be output can be obtained according to the number of terminals and the amount of information. Then, the target value of the transmission power is converted into a detection voltage, and given a certain width, the upper limit is V _H and the lower limit is V _L.

FIG. 6 is a flowchart illustrating an example of transmission power control executed by the control unit 215. In the figure, when the process is started, the control unit 215 measures the detection voltage V (step S1). Subsequently, the control unit 215 determines whether or not the detection voltage is greater than the upper limit value V _H (step S2). Here, if the determination result is “NO”, that is, if the detection voltage V is equal to or lower than the upper limit value, the control unit 215 subsequently determines whether or not the detection voltage V is smaller than the lower limit value V _L (step S3). ). If “NO”, that is, if the detection voltage V is equal to or higher than the lower limit value, it is determined that the detection voltage is within the target value range, so that the control unit 215 repeats steps S1 to S3.

On the other hand, when the detection voltage V is larger than the upper limit value V _H in step S2, the control unit 215 first determines whether or not the attenuation factor setting of the attenuator 206 is at the upper limit (step S4). If not, the communication unit 204 is controlled to increase its output by increasing the attenuation factor of the attenuator 206 by a certain value (step S5). And the control part 215 measures the detection voltage V again (step S1), and performs judgment of step S2. Thus, the process of continuously decreasing the attenuation rate is repeated until the relationship of V ≦ V _H is satisfied.

If the detection voltage V is smaller than the lower limit value _VL in step S3, the control unit 215 first determines whether or not the attenuation factor setting of the attenuator 206 is at the lower limit (step S6). If not, the communication unit 204 is controlled to decrease its output by decreasing the attenuation factor of the attenuator 206 by a certain value (step S7). And the control part 215 measures the detection voltage V again (step S1), and performs judgment of step S3. In this way, the process of continuously increasing the attenuation rate is repeated until the relationship of V ≧ V _L is satisfied.
When the attenuation rate is at the upper limit in step S4 or when the attenuation rate is at the lower limit in step S6, the control unit 215 performs processing for stopping the transmission to the communication unit 204 (step S8). .

Through the above processing, control is performed such that the transmission power actually detected in the communication device 2 of the base station 1 is between the upper limit value and the lower limit value as target values. Therefore, when the modulation scheme is OFDMA, it is possible to provide a communication apparatus or transmission method that can set and maintain transmission power at a target value.
Further, by setting the target value within the range between the upper limit value and the lower limit value, the target value can be widened, so that it is possible to prevent the output from being controlled excessively.

<< Embodiment Regarding Terminal Communication Device >>
FIG. 7 is a circuit diagram showing the main part of the internal circuit of the communication device 3 in the terminal. In the figure, the circuit configuration of the communication apparatus 3 is the same as that of the communication apparatus 2 in FIG. 3, and elements 201 to 215 in FIG. 3 correspond to elements 301 to 315 in FIG. 7 as they are. The circuit operation is the same.

  The communication device 3 receives the downlink subframe from the communication device 2 of the base station, and performs uplink transmission at a timing and transmission condition that is permitted from the communication device 2 of the base station. In FIG. 7, at the time of reception, the switch 302 selects the electric circuit Lr, and the transmission signal from the communication device 2 of the base station is received by the antenna 301, then amplified by the amplifier 303, and is stored in the communication unit 304. Provided to the wireless unit 305. On the other hand, at the time of transmission, the switch 302 has selected the electric circuit Ls, and the transmission signal generated by the wireless unit 305 is output via the attenuator 306, amplified by the amplifier 308, and transmitted from the antenna 301. .

  (A) of FIG. 8 assumes that there are a plurality of terminals (for example, five or more) that perform communication, from the wireless unit 305 during transmission (uplink) from the communication device 3 of each terminal to the communication device 2 of the base station. It is a figure which shows an example of the uplink sub-frame (solid line) which looked at the transmitted signal in the communication apparatus 2 of the base station on the time axis versus the frequency axis, the horizontal axis represents time, and the vertical axis represents frequency. . A two-dot chain line represents a downlink subframe.

The uplink subframes are multiplexed on the frequency axis, and there is an information area for the number of subchannels in the area with the highest frequency, and below this is an UL burst (uplink) that is information from the communication device 3 of each terminal. (In this example, UL bursts are # 1 to # 5). As shown in the figure, UL bursts # 1 to # 5 are allocated to five regions generated by multiplexing on the frequency axis. This is an example of basic area allocation, and there may be a case where time-multiplexed area allocation is performed.
Similarly, (b) of FIG. 8 represents an uplink subframe configured by an area of the number of subchannels and UL bursts # 1 to # 4.

  On the other hand, (a) in FIG. 9 shows the UL burst # 1 (a part of the uplink subframe) in (b) in FIG. FIG. The transmission signal based on the UL burst # 1 is output from the radio unit 305 (including the attenuator 306) in FIG. The power output from the amplifier 308 is detected by the directional coupler 309, detected by the amplifier / detector 311, converted into a detected voltage, converted into a digital signal by the A / D converter 314, and then input to the control unit 315. Is done. Note that the control unit 315 can instruct the A / D converter 314 when to receive the digital signal. Similarly, the power of the reflected wave is detected by the directional coupler 309, detected by the amplifier / detector 310, converted into a detected voltage, converted into a digital signal by the A / D converter 313, and then the control unit 315. Is input. The control unit 315 obtains a detection voltage corresponding to the transmission power based on the two detection voltages.

  FIG. 9B is a graph showing transmission power (detection voltage) based on UL burst # 1 in FIG. As shown in the figure, the waveform of the transmission power in the time zone corresponding to the UL burst # 1 is substantially proportional to the width (height) on the frequency axis of the UL burst # 1. It should be noted that after the end of UL burst # 1, it is not the timing of transmission, but a waveform in which the residual voltage falls transiently and decreases.

Next, (c) of FIG. 9 is a diagram showing a case where UL burst # 1 is assigned to a larger area than (a), with the horizontal axis representing time and the vertical axis representing frequency. In this example, the region is expanded to adjacent frequency bands, but the same applies to the case where a plurality of regions are assigned to frequency bands that are not adjacent to one terminal.
9D is a graph showing transmission power (detection voltage) based on UL burst # 1 in FIG. 9C. As shown in the figure, the waveform of the transmission power in the time zone corresponding to the UL burst # 1 in (c) is substantially proportional to the width (height) on the frequency axis of the UL burst # 1. It should be noted that after the end of UL burst # 1, it is not the timing of transmission, but a waveform in which the residual voltage falls transiently and decreases.

  (E) of FIG. 9 is a time chart which shows the timing which transmits an uplink sub-frame. This signal is output from the switching signal generation unit 307 (FIG. 7), and the rising and falling edges of the signal are a switching signal from reception to transmission and a switching signal from transmission to reception, respectively. As shown in the figure, the timing at which the switching signal is output is slightly shifted from the start / end timing of the uplink subframe.

As is clear from FIGS. 9A to 9D, the transmission power varies depending on the UL burst allocation. Therefore, for example, the transmission power at the elapse of the predetermined time Δt from the switching signal from reception to transmission in (e) of FIG. 9 is the UL burst # 1 as shown in (b) or (d). Therefore, the target value of the transmission power can be obtained by calculation. Thereby, the target value of the transmission power to be output can be obtained according to the allocated information area. Then, the target value of the transmission power is converted into a detection voltage, and given a certain width, the upper limit is V _H and the lower limit is V _L. Subsequent transmission power control is the same as the processing shown in FIG.

By such processing, control is performed so that the transmission power actually detected in the communication device 3 of the terminal is between the upper limit value and the lower limit value as target values. Therefore, when the modulation scheme is OFDMA, it is possible to provide a communication apparatus or transmission method that can set and maintain transmission power at a target value.
Further, by setting the target value within the range between the upper limit value and the lower limit value, the target value can be widened, so that it is possible to prevent the output from being controlled excessively.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of claims for patent, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims for patent.

It is a figure which shows the state which performs the radio | wireless communication between the communication apparatus of a base station, and the communication apparatus of 1 or several (only one is shown) which has an antenna. It is a figure which shows the signal transmitted from the communication apparatus of a base station, the signal transmitted to a communication apparatus from a terminal, and TDD control in a communication apparatus. It is a circuit diagram which shows the principal part of the internal circuit of the communication apparatus in a base station. (A) is a figure which shows an example of a downlink sub-frame, (b) is a graph which shows the transmission power (detection voltage) based on the downlink sub-frame of (a). Moreover, (c) is a time chart which shows the timing which transmits a downlink sub-frame. (A) is a figure which shows the other example of a downlink sub-frame, (b) is a graph which shows the transmission power (detection voltage) based on the downlink sub-frame of (a). Moreover, (c) is a time chart which shows the timing which transmits a downlink sub-frame. It is a flowchart which shows an example of transmission power control performed by a control part. It is a circuit diagram which shows the principal part of the internal circuit of the communication apparatus in a terminal. Uplink subframes (solid lines) of signals transmitted during transmission (uplink) from the communication device of each of the multiple terminals to the base station communication device as seen on the time axis versus frequency axis in the base station communication device These are two examples ((a) and (b)), with the horizontal axis representing time and the vertical axis representing frequency. (A) is the figure which looked at the transmission side, ie, the communication apparatus of a terminal, with UL burst # 1 (a part of an uplink sub-frame) in (b) of FIG. 8 with time on the horizontal axis and frequency on the vertical axis. . (B) is a graph which shows the transmission power (detection voltage) based on UL burst # 1 of (a). (C) is a diagram showing a case where UL burst # 1 is assigned to an area larger than (a), with the horizontal axis representing time and the vertical axis representing frequency. (D) is a graph which shows the transmission power (detection voltage) based on UL burst # 1 of (c). (E) is a time chart which shows the timing which transmits an uplink sub-frame.

Explanation of symbols

1: base station, 2: communication device, 3: terminal, 201: antenna, 202: switch, 203: amplifier, 204: communication unit, 205: radio unit, 206: attenuator, 207: switching signal generation unit, 208: Amplifier: 209: Directional coupler, 210: Amplifier / detector, 211: Amplifier / detector, 212: Power detector, 213: A / D converter, 214: A / D converter, 215: Controller, 301: Antenna 302: switching unit 303: amplifier 304: communication unit 305: wireless unit 306: attenuator 307: switching signal generation unit 308: amplifier 309: directional coupler 310: amplifier / detector 311: Amplifier / detector 312: Power detection unit 313: A / D converter 314: A / D converter 315: Control unit

Claims (6)

A communication device of a base station that performs wireless communication with a communication device of one or more terminals,
For the communication device of the terminal, a communication unit that generates a downlink subframe in which information is multiplexed on a time axis and a frequency axis, and outputs a transmission signal based thereon,
An amplifier for amplifying the transmission signal;
A power detector for detecting transmission power based on the output of the amplifier;
Based on the downlink burst allocation information, the transmission power corresponding to the number of terminals and the amount of information at a predetermined time in the downlink subframe starting from the switching signal from reception to transmission is obtained, and the transmission power is determined as the transmission power. And a control unit that controls the output of the communication unit so that the transmission power detected by the power detection unit is maintained at the target value. A communication device of a terminal that performs wireless communication with a communication device of a base station,
A communication unit that outputs a transmission signal based on a use region of at least an uplink burst allocated on the frequency axis;
An amplifier for amplifying the transmission signal;
A power detector for detecting transmission power based on the output of the amplifier;
Based on the use area of the uplink burst, the transmission power corresponding to the allocated information area at the predetermined time point in the uplink burst starting from the switching signal from reception to transmission is obtained, and the transmission power is A control unit that determines the transmission power target value and controls the output of the communication unit so that the transmission power detected by the power detection unit in the use region is maintained at the target value. A communication device characterized by the above.   The communication unit includes a switching signal generation unit that generates a transmission / reception switching signal, and the control unit, after the switching signal generation unit outputs a switching signal for starting transmission, after a predetermined time, The communication apparatus according to claim 1, wherein the predetermined time is set.   The power detection unit includes means for detecting and detecting the output of the amplifier, and the control unit controls the output of the communication unit so that a voltage obtained by detection falls within a predetermined range. Or the communication apparatus of 2. A transmission method in a communication device of a base station that performs wireless communication with a communication device of one or more terminals,
For the communication device of the terminal, generate a downlink subframe in which information is multiplexed on the time axis and the frequency axis, and output a transmission signal based on this,
Amplifying the transmission signal;
Detect the transmission power based on the amplified output,
Based on the downlink burst allocation information, the transmission power corresponding to the number of terminals and the amount of information at a predetermined time in the downlink subframe starting from the switching signal from reception to transmission is obtained, and the transmission power is determined as the transmission power. A transmission method characterized by controlling the output so that the detected transmission power is maintained at a predetermined target value. A transmission method in a communication device of a terminal that performs wireless communication with a communication device of a base station,
Output a transmission signal based on the use area of the uplink burst allocated at least on the frequency axis,
Amplifying the transmission signal;
Detect the transmission power based on the amplified output,
Based on the use area of the uplink burst, the transmission power corresponding to the allocated information area at the predetermined time point in the uplink burst starting from the switching signal from reception to transmission is obtained, and the transmission power is transmission method determining a target value of the transmission power, transmission power detected Te such use area smell, and controls the output so that the target value.

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