WO2008007428A1 - Appareil de transmission radio et procédé de commande de la puissance de transmission - Google Patents

Appareil de transmission radio et procédé de commande de la puissance de transmission Download PDF

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Publication number
WO2008007428A1
WO2008007428A1 PCT/JP2006/313888 JP2006313888W WO2008007428A1 WO 2008007428 A1 WO2008007428 A1 WO 2008007428A1 JP 2006313888 W JP2006313888 W JP 2006313888W WO 2008007428 A1 WO2008007428 A1 WO 2008007428A1
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WIPO (PCT)
Prior art keywords
transmission
value
average
signal
transmission level
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PCT/JP2006/313888
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English (en)
Japanese (ja)
Inventor
Tadahiro Sato
Original Assignee
Fujitsu Limited
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Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2006/313888 priority Critical patent/WO2008007428A1/fr
Publication of WO2008007428A1 publication Critical patent/WO2008007428A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo

Definitions

  • the present invention relates to a radio transmission apparatus that performs transmission power control and a transmission power control method thereof.
  • FIG. 15 is a block diagram showing a functional configuration of a conventional wireless transmission device.
  • a conventional wireless transmission apparatus includes a signal processing unit 300, a digital Z analog conversion unit (hereinafter referred to as a DZA conversion unit) 301 and 302, a TPC (Transmit Power Control) amplification unit 303, a power amplifier. (Power Amplifier) 304, coupler 305, transmission level monitor circuit 306, analog / digital converter (hereinafter referred to as AZD converter) 307, antenna 320, and the like.
  • a signal processing unit 300 includes a signal processing unit 300, a digital Z analog conversion unit (hereinafter referred to as a DZA conversion unit) 301 and 302, a TPC (Transmit Power Control) amplification unit 303, a power amplifier. (Power Amplifier) 304, coupler 305, transmission level monitor circuit 306, analog / digital converter (hereinafter referred to as AZD converter) 307, antenna 320, and the like.
  • the main signal generated by the signal processing unit 300 is converted into an analog signal by the DZA conversion unit 301 and sent to the TPC amplification unit 303.
  • This analog signal is quadrature modulated by the TPC amplifier 303 (orthogonal modulator 311), converted to a radio frequency (frequency converter 31 2), amplified by the power amplifier 304, and then via the coupler 305. Transmitted from antenna 320.
  • the transmission level of the signal transmitted from antenna 320 may not be the power level expected by signal processing unit 300. This is because the main signal is subjected to gain fluctuations from the analog circuit that constitutes the wireless transmission device. In order to eliminate such a phenomenon, the wireless transmission device performs the following automatic gain correction.
  • Transmission level monitor circuit 306 receives a signal obtained by branching modulated wave signal to be transmitted from antenna 320 by cutter 305, and sequentially generates a transmission level feedback signal indicating the transmission level of this signal. .
  • the transmission level monitor circuit 306 includes a diode detection circuit and the like for detecting the transmission level, and outputs a transmission level feedback signal according to the characteristics shown in FIG. 16 of the detection circuit.
  • Figure 16 shows the transmission level mode. The relationship between the transmission level of the signal input to the Utah circuit 306 (dBm (absolute power with 1 milliwatt (mW) as the reference (0))) and the transmission level feedback signal output from the transmission level monitor circuit 306 is shown.
  • the transmission level feedback signal output from the transmission level monitor circuit 306 is converted into a digital signal by the AZD conversion unit 307 and fed back to the signal processing unit 300. Since the transmission level monitor circuit 306 is configured so that the gain fluctuation due to the operating environment conditions is extremely small, a transmission level feedback signal based on a transmission level substantially the same as the transmission level at the actual antenna end is used. Can be generated.
  • the signal processing unit 300 includes a signal generation unit 330, an automatic gain correction unit 331, and the like.
  • the automatic gain correction unit 331 receives this transmission level feedback signal and checks whether the transmission signal has a desired transmission level (output power setting value). In this inspection, automatic gain correction section 331 obtains the average transmission power from the transmission level feedback signal received within a predetermined time according to the characteristics shown in FIG. 16, and compares this average transmission power with the output power setting value. .
  • the automatic gain correction unit 331 outputs a predetermined TPC signal for controlling the variable attenuator 313 according to the inspection result.
  • the variable attenuator 313 adjusts the signal level output from the power amplifier 304 (gain correction) according to the analog signal (control voltage) obtained by converting the TPC signal by the DZ A conversion unit 302. As a result, the signal output from the power amplifier 304 becomes a signal having a desired transmission level and is transmitted from the antenna 320.
  • the automatic gain correction unit 331 described above when the average transmission power obtained from the transmission level feedback signal is smaller than the output power setting value, the gain (analog gain) of the TPC amplification unit 303 ) Is increased, and when the average transmission power obtained from the transmission level feedback signal is larger than the output power setting value, a TPC signal is generated so that the gain of the TPC amplification section 303 is decreased.
  • the automatic gain correction unit 331 generates a TPC signal based on the feedback signal from the transmission level motor circuit 306 so that the transmission level of the signal to which the antenna force is transmitted becomes a desired power level.
  • the transmission level feed generated from the main signal gain-corrected by the TPC signal The expected value of the transmission level indicated by the back signal changes according to the average power (DZA input power) of the main signal input to the DZA converter 301. This is apparent from the fact that the average output power at the antenna 320 end changes according to the average power of the main signal input to the D ZA converter 301 even when the analog circuit such as the variable attenuator 313 has a constant gain. It is.
  • each frame consists of one reference channel and five data channels.
  • the reference channel is time-multiplexed with the data channel at regular intervals, and is used for channel estimation and channel quality information measurement.
  • the signal generation unit 330 of the signal processing unit 300 generates such a radio frame and sends it to the DZA conversion unit 301 as a main signal.
  • a conventional radio transmission apparatus may set the analog gain update cycle, that is, the TPC signal update cycle to one frame interval. is there.
  • FIG. 18 is a conceptual diagram when one frame interval is set as the TPC signal update period.
  • the above-described wireless transmission device calculates the average transmission power from the transmission level feedback signal during the update period, and executes gain correction according to the average transmission power.
  • the power level of the transmission signal is set to an appropriate power by the automatic gain correction function. Can keep.
  • Patent Document 1 Japanese Patent Laid-Open No. 7-221700
  • the transmission power is often varied for each channel in the frame.
  • the TPC signal is updated at the update cycle shown in Fig. 18, so the TPC signal is not generated based on the power value approximating the actual transmission level. Because.
  • the conventional wireless transmission device needs to prevent the automatic gain correction function from operating. That is, it is necessary to switch whether or not to operate the gain correction function depending on whether the transmission power is constant or varied in a frame.
  • An object of the present invention is to provide a radio transmission apparatus that performs highly accurate transmission power control and a transmission power control method thereof.
  • the present invention adopts the following configuration in order to solve the above-described problems. That is, the present invention relates to a wireless transmission apparatus that transmits a transmission signal by varying the transmission level of the transmission signal, and a detection means for detecting the transmission level of the transmission signal and an expectation of the transmission level of the transmission levels detected by the detection means.
  • a calculation unit that calculates a gain correction value using a transmission level in a section in which the value is constant; and a correction unit that performs gain correction of a transmission signal based on the gain correction value.
  • a transmission level for example, transmission power or transmission voltage
  • the expected value of the transmission level is constant among the detected transmission levels.
  • the gain correction value is calculated using the transmission level of the signal. Then, the gain correction of the transmission signal is executed based on the gain correction value.
  • the expected value of the transmission level is a value that can be obtained by a signal processing unit or the like that determines the fluctuation of the transmission level, and is an ideal value when there is no gain fluctuation of an analog circuit or the like.
  • the present invention provides at least a reference channel and a control channel among the plurality of channels when the transmission signal is multiplexed with a plurality of channels as a section in which the expected value of the transmission level is constant. One section may be used.
  • the transmission level of the reference channel and the control channel is often kept constant. Therefore, using the transmission level of such a channel makes it appropriate even if the transmission level fluctuates. Automatic gain correction can be performed.
  • the calculation means includes an average calculation means for calculating an average transmission level in a section in which an expected value of the transmission level is constant, and a transmission level in a section in which the expected value of the transmission level is constant. Holding means for holding an average expected value; comparing means for calculating a difference between the average transmission level and the average expected value; and correcting means for correcting the gain correction value using the difference obtained by the comparing means as a change amount; Even if it is realized to be equipped with. Further, the correction means may use a predetermined correction value corresponding to the difference obtained by the comparison means as the change amount.
  • the average calculating means may use a symbol time as a section for calculating the average transmission level. This makes it possible to calculate a substantially uniform average transmission level even when the frame configuration includes a guard interval or the like in the multiplexed channel.
  • the present invention may be a method for causing a computer to realize any one of the functions described above. Further, the present invention may be a program or a circuit for realizing any of the above functions. In the present invention, such a program may be recorded on a computer-readable storage medium.
  • FIG. 1 is a functional configuration diagram of a signal processing unit in the first embodiment.
  • FIG. 2 is a diagram showing a radio frame format in the first embodiment.
  • FIG. 3 is a diagram showing an example of output power setting values in the first embodiment.
  • FIG. 4 is a diagram showing an example of the DZA input power value of the main signal in the first embodiment.
  • FIG. 5 is a data transition diagram showing gain correction in the first embodiment.
  • FIG. 6 is a diagram illustrating a functional configuration example of a signal processing unit in the second embodiment.
  • FIG. 7 is a diagram showing an example of output power setting values in the second embodiment.
  • FIG. 8 is a diagram showing an example of the DZA input power value of the main signal in the second embodiment.
  • FIG. 9 is a data transition diagram showing gain correction in the second embodiment.
  • FIG. 10 is a diagram illustrating a functional configuration example of a signal processing unit in the third embodiment.
  • FIG. 11 is a diagram showing an example of the DZA input power value of the main signal.
  • FIG. 12 is a diagram showing a radio frame format.
  • FIG. 13 is a diagram showing an average feedback value calculation interval.
  • FIG. 14 is a data transition diagram showing gain correction in the third modified example.
  • FIG. 15 is a diagram showing a functional configuration of a conventional wireless transmission device.
  • FIG. 16 is a diagram showing a correlation characteristic between a transmission level and a transmission level feedback signal.
  • FIG. 17 is a diagram showing a radio frame format.
  • FIG. 18 is a conceptual diagram in which one frame interval is set as a TPC signal update period.
  • FIG. 19 is a diagram showing average transmission power that does not vary within a frame.
  • FIG. 20 is a diagram showing average transmission power that fluctuates within a frame.
  • the wireless transmission device in the first embodiment includes the same functional units as those of the conventional wireless transmission device shown in FIG. That is, the radio transmission apparatus according to the first embodiment includes a signal processing unit 300, DZ A conversion units 301 and 302, a TPC amplification unit 303, a power amplifier 304, a coupler 305, and a transmission level monitor circuit 306 (in the detection means of the present invention). Equivalent), AZD converter 307, antenna 320, etc.
  • the TPC amplification unit 303 includes an orthogonal modulation unit 311, a frequency conversion unit 312, and a variable attenuator 313.
  • the signal processing unit 300 executes a program stored in the memory with a DSP (Digital Signal Processor). It is a functional unit that realizes digital signal processing by being executed on a processor such as.
  • FIG. 1 is a diagram illustrating a functional configuration example of a signal processing unit in the first embodiment.
  • the signal processing unit 300 in the first embodiment includes a signal generation unit 330 and an automatic gain correction unit 331.
  • the automatic gain correction unit 331 includes an expected value calculation unit 101, buffers 103 and 111. , Average transmission power calculation section 113, correction value calculation section 120, addition sections 121 and 123, and the like.
  • each of these functional units will be described.
  • the signal generator 330 generates a main signal having the radio frame format shown in FIG. 2, for example.
  • FIG. 2 is a diagram showing a radio frame format in the first embodiment. In the format shown in Fig. 2, reference channels are arranged at two locations in one frame.
  • the signal generation unit 330 sends the generated main signal to the DZA conversion unit 301.
  • the signal generation unit 330 notifies the automatic gain correction unit 331 of the sending timing.
  • the reference signal is a signal arranged in the reference channel in the format shown in FIG.
  • the signal generation unit 330 notifies the automatic gain correction unit 331 of the transmission timing of the reference signal arranged at the head of each frame. Note that the signal generator 330 may notify the transmission timing of the other reference signal!
  • the power of using the radio frame format shown in Fig. 2 as an example is not limited to such a radio frame format.
  • a radio frame format such as the example shown in FIG. 17 may be used.
  • the signal generation unit 330 further notifies the automatic gain correction unit 331 of the power level (hereinafter referred to as DZA input power value) and the output power setting value of the main signal sent to the DZA conversion unit 301.
  • the output power setting value is an expected value of the transmission level of the signal transmitted from the antenna 320.
  • the expected value calculation unit 101 receives the output power setting value from the signal generation unit 330 and calculates an expected value of the transmission level feedback signal corresponding to the output power setting value related to the reference signal.
  • the expected value calculation unit 101 obtains an expected value of the transmission level feedback signal using the correlation characteristic (see FIG. 16) between the transmission level and the transmission level feedback signal.
  • the calculated expected value is sent to the buffer 103.
  • the expected value calculation unit 101 corresponds to the holding means of the present invention.
  • the nofers 103 and 111 are holding units for delaying received data for a predetermined time and sending them to other functional units.
  • the nofer 103 delays the expected value of the transmission level feedback signal sent from the expected value calculation unit 101 by a predetermined time and sends it to the correction value calculation unit 120.
  • the notch 111 delays the reference signal transmission timing notification sent from the signal generation unit 330 by a predetermined time and sends it to the average transmission power calculation unit 113.
  • the delay time given by each buffer is the time from when the main signal is transmitted from the signal processing unit 300 until the transmission level feedback signal corresponding to the main signal reaches the automatic gain correction unit 331. Feedback time. With this delay time, the correction value calculation unit 120 (to be described later) can compare the transmission level related to the main signal at the time of output from the signal processing unit 300 with the transmission level at the end of the antenna 320. .
  • the average transmission power calculation unit 113 receives the transmission level feedback signal generated by the transmission level monitor circuit 306 and digitized by the AZD conversion unit 307, and the transmission timing of the reference signal delayed by the feedback time by the buffer 111. .
  • the average transmission power calculation unit 113 extracts a feedback value related to the reference signal for the transmission level feedback signal power that is sequentially input based on the transmission timing of the reference signal.
  • Average transmission power calculation section 113 calculates an average feedback value by averaging the feedback values related to the extracted reference signal in the reference channel section.
  • the calculated average feedback value corresponds to the average transmission power of the reference signal.
  • the average feedback value is sent to the correction value calculation unit 120.
  • Average transmission power calculator 11 3 corresponds to the average calculating means of the present invention.
  • the average feedback value is calculated by referring to only the reference signal portion of the feedback signal sent from the transmission level monitor circuit 306.
  • the reference channel is a channel in which data used for demodulating and decoding data in other channels (data channel, etc.) is placed and is often maintained at a constant transmission level. is there.
  • the present invention is not limited to the use of only the reference channel (described later as a modification).
  • Correction value calculation section 120 compares the expected value of the transmission level feedback signal sent from notch 103 with the average feedback value sent from average transmission power calculation section 113 to calculate a correction value.
  • the correction value calculation unit 120 corresponds to the calculation means, comparison means, and correction means of the present invention.
  • the correction value calculation unit 120 adds a value obtained by subtracting the average feedback value to the expected value force to the previously calculated correction value, thereby obtaining a new correction value.
  • the correction value calculated in this way is converted into a power value corresponding to the value and sent to the adding unit 123.
  • the correlation characteristic between the transmission level and the transmission level feedback signal shown in FIG. 16 is used.
  • the adding unit 121 also subtracts the DZA input power value from the output power set value power, and sends the calculated power value to the adding unit 123.
  • Adder 123 adds the power value sent from adder 121 and the correction value sent from correction value calculator 120, and outputs a TPC signal corresponding to the calculated power value.
  • This output TPC signal is used for gain control of the TPC amplifier 303. Thereafter, the signal whose power has been corrected according to the TPC signal is branched by the coupler 305, and a transmission level feedback signal is generated by the transmission level monitor circuit 306 according to the branched signal and fed back to the signal processing unit 300. Is done.
  • the adder 123 corresponds to the correcting means of the present invention.
  • FIGS. 3, 4 and 5 are used for the operation example of the wireless transmission device in the first embodiment. And explain.
  • FIG. 3 is a diagram showing an example of the output power setting value in the first embodiment
  • FIG. 4 is a diagram showing an example of the DZA input power value of the main signal in the first embodiment
  • FIG. It is a data transition figure showing gain correction in one embodiment.
  • the output power set value and the DZA input power value are determined so that the analog gain in the frame is constant in the configuration.
  • each broken line shown in the vertical axis direction in FIGS. 3 and 4 indicates each channel section of the radio frame format shown in FIG.
  • the data transition shown in Fig. 5 is an example when the update cycle of the analog gain, that is, the update cycle of the TPC signal is set to one frame interval as shown in Fig. 18.
  • the signal generation unit 330 outputs the main signal to the DZA conversion unit 301, and sends the DZA input power value of the reference signal arranged in the first reference channel of each frame of the main signal to the addition unit 121. Then, the output power set value of the reference signal is sent to the adding unit 121 and the expected value calculating unit 101, and the output timing of the reference signal is notified to the buffer 111. At this time, 20 (dBm) is sent as the output power setting value for the first reference channel of the leftmost frame in FIG. In addition, 3 (dB) is sent as the DZA input power value for the first reference channel in the leftmost frame in Fig. 4.
  • FIG. 5 shows a state in which the data calculated by each function unit in the automatic gain correction unit 331 is controlled and transitioned according to the average feedback value calculated by the average transmission power calculation unit 113 (from the upper part of the figure to the lower part of the figure). Showing the transition).
  • Each section delimited by a dashed line shown in FIG. 5 represents one frame interval (analog gain update cycle) in FIGS.
  • the numerical values represented as “DZA input power value” and “output power set value” in FIG. 5 indicate data sent from the signal generation unit 330 as described above, and “expected value”.
  • the numerical value indicated as “” indicates the power value corresponding to the expected value of the transmission level feedback signal calculated by the expected value calculation unit 101, and the numerical value expressed as “correction value” is calculated by the correction value calculation unit 120.
  • the numerical value indicated as “TPC set value” indicates the set power value corresponding to the TPC signal to be output from the adder 123.
  • the numerical value represented as “average transmission power” indicates a power value corresponding to the average feedback value of only the reference signal calculated by the average transmission power calculation unit 113.
  • the correction value output from the correction value calculation unit 120 is O (dB) as the initial value.
  • the TPC signal output from the adder 123 corresponds to a power value (no correction) obtained by subtracting the DZA input power value (3 (dB)) from the output power setting value (20 (dBm)) ( 17 (dB)).
  • a signal whose gain is controlled by the TPC amplification section 303 is transmitted from the antenna by this TPC signal, while a transmission level feedback signal indicating the transmission power of the signal is sequentially fed back to the average transmission power calculation section 113.
  • the expected value calculation unit 101 calculates the expected value of the transmission level feedback signal as 20 (dBm) based on the output power setting value (20 (dBm)) and is delayed by the buffer 103.
  • average transmission power calculation section 113 calculates the average feedback value of the reference signal among the fed back transmission level feedback signals.
  • the power value (average transmission power) corresponding to this average feedback value is calculated as 18 (dBm).
  • the calculated average transmission power is sent to the correction value calculation unit 120.
  • Correction value calculation section 120 calculates the expected value (20
  • the correction value calculation unit 120 subtracts the average transmission power (18 (d Bm)) from the expected value (20 (dBm)) of the transmission level feedback signal, and further obtains the obtained power value (2 (dB)). It is added to the previous correction value (here, 0 as the initial value) to obtain a new correction value (2 (dB)).
  • This correction value is added by the adder 123 with the power value (17 (dB)) sent from the adder 121.
  • a TPC signal corresponding to the calculated power value (19 (dB)) is generated and sent to the TPC amplifier 303.
  • TPC signal corresponding to the previously calculated power value (19 (dB)) is output during
  • correction value calculation section 120 a value obtained by subtracting the average transmission power (21 (dBm)) from the expected value (20 (dBm)) of the previously calculated transmission level feedback signal (-1 (dB) ) Is added to the previous correction value (2 (dB)) to obtain the correction value (1 (dB)).
  • This correction value is added by the adder 123 with the power value (17 (dB)) sent from the adder 121.
  • a TPC signal corresponding to the calculated power value (18 (dB)) is generated and sent to the TPC amplifier 303.
  • a value (0) obtained by subtracting the average transmission power (20 (dBm)) from the expected value (20 (dBm)) of the transmission level feedback signal calculated previously is the previous value.
  • the correction value (l (dB)) is added to obtain the correction value (l (dB)).
  • This correction value is added by the adder 123 with the power value (11 (dB)) sent from the adder 121.
  • a TPC signal corresponding to the power value (12 (dB)) calculated in this way is generated and sent to the TPC amplifier 303.
  • the automatic gain correction device adjusts the transmission level (power or voltage) of the signal transmitted from the antenna 320 to an appropriate power level.
  • the function is executed.
  • the signal level to be transmitted from the antenna 320 is also detected by the transmission level monitor circuit 306, and a transmission level feedback signal indicating the transmission level is fed back to the signal processing unit 300.
  • the signal processing unit 300 calculates an average feedback value obtained by averaging the transmission level feedback signals related to the reference signal, and determines a transmission power correction value based on the average feedback value related to the reference signal. In this determination, a new correction value is obtained by using the difference between the expected value of the transmission level feedback signal corresponding to the output power setting value, which is the expected value of the transmission level of the signal at the antenna end, and the average feedback value of the reference signal as a change amount. It is determined. Thereafter, the TPC signal reflecting this correction value is sent to the TPC amplifying unit 303, and the transmission level of the main signal is adjusted according to this TPC signal.
  • the average transmission power of only the reference signal transmitted at a constant transmission power among the transmission signals is calculated, and the transmission power is calculated based on the average transmission power.
  • the correction value is determined, and the transmission level of the main signal is adjusted based on the correction value.
  • FIG. 6 is a diagram illustrating a functional configuration example of the signal processing unit in the second embodiment.
  • the wireless transmission device in the second embodiment is obtained by modifying the automatic gain correction unit 331 of the signal processing unit 300 in the first embodiment.
  • Other than the modified automatic gain correction unit 331 is the same as that of the first embodiment, and thus the description thereof is omitted here.
  • the expected value calculation unit 101 In the automatic gain correction unit 331 in the first embodiment, the expected value calculation unit 101 expects the transmission level feedback signal based on the output power setting value related to the reference signal.
  • the expected value calculation unit 101 in the second embodiment calculates the expected value based on the power value obtained by adding the output power setting value and the DZA input power value with respect to the reference signal.
  • the adding unit 123 adds the output power setting value and the correction value sent from the correction value calculating unit 120, and generates a TPC signal corresponding to the obtained power value.
  • FIG. 7 is a diagram showing an example of the output power setting value in the second embodiment
  • FIG. 8 is a diagram showing an example of the DZA input power value of the main signal in the second embodiment
  • FIG. It is a data transition diagram showing gain correction in two embodiments.
  • Each broken line shown in the vertical axis direction in FIGS. 7 and 8 indicates a section of each channel in the radio frame format shown in FIG.
  • the data transition shown in FIG. 9 is an example when the analog gain update cycle, that is, the TPC signal update cycle is set to one frame interval as shown in FIG.
  • FIG. 9 shows a state of transition controlled (transition from the upper part of the figure to the lower part of the figure) according to the average feedback value calculated by the average transmission power calculation unit 113.
  • the meanings of the numerical values in FIG. 9 are the same as those in FIG.
  • the DZA input power value (+3 (dB)) and the output power setting value (1) for the reference signal placed at the beginning of the leftmost frame in FIGS. 7 (dBm)) is input to the automatic gain correction unit 331. Also, the correction value output from the correction value calculation unit 120 is 0 (dB) as an initial value.
  • the TPC signal output from the adding unit 123 becomes (17 (dBm)) corresponding to the output power setting value (17 (dBm)).
  • a signal whose gain is controlled by the TPC amplification unit 303 is transmitted from the antenna by the TPC signal, while a transmission level feedback signal corresponding to the transmission power of the signal is sequentially fed back to the average transmission power calculation unit 3.
  • the expected value calculation unit 101 determines the expected value of the transmission level feedback signal based on the added power value of the output power setting value (17 (dBm)) and the DZA input power value (+3 (dB)). Calculated as 20 (dBm) and delayed by the buffer 103.
  • the DZA input power value (+3 (dB)) and the output power setting value (17 (dBm)) related to the reference signal arranged at the head of the second frame from the left are input to the automatic gain correction unit 331.
  • Average transmission power calculation section 113 calculates the average feedback value of the reference signal among the fed back transmission level feedback signals. Here, it is assumed that the power value (average transmission power) corresponding to this average feedback value is calculated as 18 (dBm). The calculated average transmission power is sent to the correction value calculation unit 120.
  • Correction value calculation section 120 calculates the expected value (20
  • the correction value calculation unit 120 subtracts the average transmission power (18 (d Bm)) from the expected value (20 (dBm)) of the transmission level feedback signal, and further obtains the obtained power value (2 (dB)). It is added to the previous correction value (here, 0 as the initial value) to obtain a new correction value (+2 (dB)). This correction value is added to the output power setting value (17 (dBm)) by the adding unit 123.
  • a TPC signal corresponding to the power value (19 (dB)) calculated in this way is generated and sent to the TPC amplifier 303.
  • correction value calculation section 120 a value obtained by subtracting the average transmission power (21 (dBm)) from the expected value (20 (dBm)) of the transmission level feedback signal calculated previously ( ⁇ 1 (dB) ) Is added to the previous correction value (2 (dB)) to obtain the correction value (+ l (dB)).
  • This correction value is added to the output power set value (17 (dBm)) by the adding unit 123.
  • a TPC signal corresponding to the power value (18 (dB)) calculated in this way is generated and sent to the TPC amplifier 303.
  • correction value calculation unit 120 a value (0) obtained by subtracting the average transmission power (20 (dBm)) from the expected value (20 (dBm)) of the transmission level feedback signal calculated previously is the previous value.
  • the correction value (l (dB)) is added to obtain the correction value (+ l (dB)).
  • This correction value is added to the output power set value (11 (dBm)) by the adding unit 123.
  • a TPC signal corresponding to the power value (12 (dB)) calculated in this way is generated and sent to the TPC amplifier 303.
  • the TPC signal is generated based on the power value obtained by correcting the output power set value by the correction value calculated by the correction value calculation unit 120;
  • the expected value calculation unit 101 is different from the first embodiment in that the expected value calculation unit 101 calculates the expected value of the transmission level feedback signal corresponding to the added value of the output power setting value and the DZA input power value.
  • a transmission power correction value is determined based on the average transmission power of only the reference signal, and the main value is determined based on the correction value. Since the signal transmission level is adjusted, automatic gain correction can be appropriately operated even when the transmission power is varied within the frame.
  • FIG. 10 is a diagram illustrating a functional configuration example of the signal processing unit in the third embodiment.
  • the wireless transmission device in the third embodiment is obtained by further modifying the automatic gain correction unit 331 in the second embodiment. Since components other than the modified automatic gain correction unit 331 are the same as those in the first embodiment and the second embodiment, description thereof is omitted here.
  • the reference The correction value of the transmission power was determined by comparing the average transmission power fed back for the signal with the expected value of the transmission level of the reference signal.
  • a transmission power correction value is determined based on a power value calculated by a predetermined weighted average for a predetermined section regardless of the channel configuration in the frame. Is done.
  • a functional unit different from the second embodiment in the automatic gain correction unit 331 in the third embodiment will be described.
  • the expected value calculation unit 101 receives the output power setting value and the DZA input power value from the signal generation unit 330. At this time, it is assumed that the DZA input power value received by the expected value calculation unit 101 changes as shown in FIG. FIG. 11 is a graph showing an example of the DZA input power value of the main signal. In addition, the expected value calculation unit 101 receives a predetermined timing notification from the signal generation unit 330 together with the above-described data. The vertical broken lines in the graph of FIG. 11 indicate the time for receiving the timing notification. This may indicate each channel section or may indicate other timing.
  • Expected value calculation section 101 calculates the weighted average depending on the DZA input power value and its transmission time in a predetermined time (between time T1 and time T7 shown in FIG. 11) according to the timing notification.
  • the expected value is calculated by adding the output power value to the output power setting value.
  • the output power setting value a constant 20 (dBm) is input, and the time interval of timing notification is constant.
  • the expected value calculation unit 101 receives the timing notification and the DZA input power value at the following times.
  • Timing T1 DZ A input power value (0 (dB))
  • Timing T2 DZ A input power value (6 (dB))
  • Timing T3 DZ A input power value (6 (dB))
  • Timing T5 DZ A input power value (3 (dB))
  • Timing T6 DZ A input power value (3 (dB)
  • the expected value calculation unit 101 calculates the expected value V based on the weighted average between the timing notification at time T1 and the timing notification at time T7 as follows.
  • the timing interval (1: T1) is weighted with respect to the DZ A input power value (O (dB)), and the timing interval (2: T2 and T3) with respect to the DZA input power value (one 6 (dB)).
  • the timing interval (3: (4— ⁇ 7) is weighted to the DZA input power value (-3 (dB)).
  • the calculated expected value is delayed by the buffer 103 and then sent to the correction value calculating unit 120.
  • the average transmission power calculation unit 113 averages the sequentially input transmission level feedback signals within a predetermined time (between time T1 and time T7 shown in FIG. 11) according to the timing notification. Calculate the value.
  • the calculated average feedback value is sent to the correction value calculation unit 120.
  • the average feedback value is calculated with reference to the signal within a predetermined time among the feedback signals sent from the transmission level monitor circuit 306.
  • an expected value obtained by weighted average of the DZA input power value and its transmission time within a predetermined time and the average of the transmission level feedback signal within the predetermined time Correct the transmit power correction value by comparing it with the feedback value. This is to perform weighting calculation processing so as to be able to cope with fluctuations in transmission power within a predetermined time.
  • automatic gain correction can be appropriately operated even in a configuration in which transmission power is varied within a frame. Further, according to the wireless transmission device in the third embodiment, an appropriate transmission power correction value can be calculated from data within a predetermined time regardless of the channel configuration in the frame, etc. Design becomes possible.
  • the average transmission power calculation unit 113 transmits data related to the reference signal among the transmission level feedback signals.
  • the force reference signal that was used to calculate the average feedback value using only the control signal only the control signal placed in the control channel may be used, or a combination of both may be used. May be.
  • a radio frame as shown in FIG. 12 is used.
  • FIG. 12 is a diagram showing a radio frame format composed of a reference channel, a control channel, and a data channel.
  • the signal generation unit 330 sends the generated main signal to the DZA conversion unit 301, and sets the transmission timing of the control signal of the main signal.
  • the automatic gain correction unit 331 may be notified.
  • average transmission power calculation section 113 extracts the feedback value related to the control signal for the transmission level feedback signal power that is sequentially input at the transmission timing of this control signal. If the feedback value for the extracted control signal is averaged over the control channel interval, the average feedback value corresponding to the average transmission power of the control signal should be calculated.
  • a reference signal and a control signal may be used in combination.
  • the signal generation unit 330 may notify the automatic gain correction unit 331 of the transmission timing of the reference signal and the control signal of the main signal. Then, the correction value is corrected by calculating the expected value and the average feedback value within the time of the combination.
  • correction value calculation section 120 changes the difference between the expected value of the transmission level feedback signal calculated by expected value calculation section 101 and the average feedback value sent from average transmission power calculation section 113 as it is.
  • a new correction value was calculated by adding it to the previously calculated correction value as an amount, but a predetermined change amount corresponding to the difference value may be determined in advance.
  • the amount of change is set to 0.5 (dB), and the expected value of the transmission level feedback signal is averaged.
  • the change amount is set to 10.5 (dB)
  • the change amount is set to O (dB).
  • Such a definition may be held in advance by the correction value calculation unit 120.
  • this definition table held by the correction value calculation unit 120 is referred to as a correction value change amount table.
  • FIG. 14 is a data transition diagram showing gain correction in the third modification.
  • the correction value calculation unit 120 receives the expected value (20 (dBm)) of the transmission level feedback signal calculated earlier and the average transmission power (18 (d Bm)), and compares them. The correction value calculation unit 120 determines that the expected value (20 (dBm)) of the transmission level feedback signal is larger than the average transmission power (18 (dBm))! / The amount of change in the correction value corresponding to this is determined as 0.5 (dB). The correction value calculation unit 120 calculates the change amount to the previous correction value (here, 0 as an initial value) to obtain a new correction value (0.5 (dB)). This correction value is added by the adder 123 with the power value (17 (dB)) sent from the adder 121. A TPC signal corresponding to the power value (17.5 (dB)) calculated in this way is generated and sent to the TPC amplifier 303.
  • the correction value calculation unit 120 determines that the expected value (20 (dBm)) of the transmission level feedback signal is smaller than the average transmission power (21 (dBm)), and the correction value change amount table power is determined accordingly. Determine the amount of change in the correction value—0.5 (dB). The correction value calculation unit 120 adds the amount of change to the previous correction value (0.5 (dB)) to obtain a new correction value (0). As a result, a TPC signal output from the adder 123 is generated as a TPC signal corresponding to the power value (17 (dB)) (no correction) sent from the adder 121 and sent to the TPC amplifier 303. .
  • the correction value calculation unit 120 determines that the expected value (20 (dBm)) of the transmission level feedback signal calculated previously and the average transmission power (20 (dBm)) are the same value, and the correction value Change amount table power Change amount 0 (no change) is determined accordingly. The Since it has been determined that there is no change amount, the correction value calculation unit 120 uses the previous correction value (0) as the new correction value (0).
  • the definition in the correction value change amount table held by the correction value calculation unit 120 is not limited to the above example.
  • the expected value of the transmission level feedback signal is also obtained by subtracting the average feedback value (difference value) greater than the upper limit value (l (dB)). )), The difference value is smaller than the lower limit value (-1 (dB)), V, and the amount of change (-1 (dB)), the difference value is less than the upper limit value (+1 (dB)) and If the value is lower than the lower limit (1 1 (dB)), it may be defined that there is no change.
  • the amount of change, the upper limit value, and the lower limit value in this example may be variable values according to the circuits constituting the device.
  • the average transmission power calculation unit 113 in the above-described embodiment receives a reference signal transmission timing, and extracts the feedback value related to the reference signal from the transmission level feedback signal sequentially input according to the timing shown in FIG. In this way, even if CP (Cyclic Prefix) is added in the reference channel, it is possible to cope with it.
  • CP Cyclic Prefix
  • the signal after the CP is added can be any time point within the CP time. Even if the original symbol time length is extracted, a substantially similar average feedback value can be calculated. For example, even if the average transmission power calculation unit 113 averages the feedback value in the time interval (1), (2), and (3) shown in FIG. Can be calculated.
  • FIG. 13 is a diagram showing an average feedback value calculation interval.
  • the average feedback value production section in the average transmission power calculation unit 113 does not need to be strictly adjusted, and can be realized with a simple circuit configuration.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Appareil de transmission radio et son procédé de commande de la puissance de transmission, ladite commande de puissance de transmission étant exécutée avec une grande fidélité. Un appareil de transmission radio, qui fait varier les niveaux de transmission des signaux de transport pour la transmission, comprend un moyen de détermination des niveaux de transmission des signaux de transport; un moyen de calcul qui utilise une partie - pour laquelle la valeur escomptée du niveau de transmission est constante - des moyens de transmission déterminés par les moyens de détermination pour calculer une valeur de correction de gain; et un moyen de correction qui exécute, en fonction de la valeur de correction de gai n, une correction de gain du signal de transport.
PCT/JP2006/313888 2006-07-12 2006-07-12 Appareil de transmission radio et procédé de commande de la puissance de transmission WO2008007428A1 (fr)

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PCT/JP2006/313888 WO2008007428A1 (fr) 2006-07-12 2006-07-12 Appareil de transmission radio et procédé de commande de la puissance de transmission

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PCT/JP2006/313888 WO2008007428A1 (fr) 2006-07-12 2006-07-12 Appareil de transmission radio et procédé de commande de la puissance de transmission

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012520005A (ja) * 2009-03-03 2012-08-30 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 基地局電力増幅器の出力電力のスケジューラ制御設定のための基地局および方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH1022756A (ja) * 1996-07-04 1998-01-23 Mitsubishi Electric Corp 無線送信機およびその送信制御方法
JP2004166245A (ja) * 2002-10-23 2004-06-10 Hitachi Kokusai Electric Inc 送信機
JP2005236572A (ja) * 2004-02-18 2005-09-02 Sony Ericsson Mobilecommunications Japan Inc 通信端末

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1022756A (ja) * 1996-07-04 1998-01-23 Mitsubishi Electric Corp 無線送信機およびその送信制御方法
JP2004166245A (ja) * 2002-10-23 2004-06-10 Hitachi Kokusai Electric Inc 送信機
JP2005236572A (ja) * 2004-02-18 2005-09-02 Sony Ericsson Mobilecommunications Japan Inc 通信端末

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012520005A (ja) * 2009-03-03 2012-08-30 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 基地局電力増幅器の出力電力のスケジューラ制御設定のための基地局および方法
US9113430B2 (en) 2009-03-03 2015-08-18 Telefonaktiebolaget L M Ericsson (Publ) Base station and method for scheduler controlled setting of the output power of a base station power amplifier

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