WO2012111266A1 - Dispositif de transmission et procédé de transmission - Google Patents

Dispositif de transmission et procédé de transmission Download PDF

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Publication number
WO2012111266A1
WO2012111266A1 PCT/JP2012/000619 JP2012000619W WO2012111266A1 WO 2012111266 A1 WO2012111266 A1 WO 2012111266A1 JP 2012000619 W JP2012000619 W JP 2012000619W WO 2012111266 A1 WO2012111266 A1 WO 2012111266A1
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WO
WIPO (PCT)
Prior art keywords
transmission
phase
signal
antenna ports
time
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PCT/JP2012/000619
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English (en)
Japanese (ja)
Inventor
星野　正幸
岩井　敬
今村　大地
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パナソニック株式会社
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Publication of WO2012111266A1 publication Critical patent/WO2012111266A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size

Definitions

  • the present invention relates to a transmission device and a transmission method.
  • a link from a terminal (UE: User Equipment) to a base station (BS (Base Station) or eNB) in a cellular communication system that is, in an uplink (Uplink)
  • BS Base Station
  • eNB eNode B
  • uplink MIMO Multiple Input Multiple Multiple Output
  • the uplink MIMO transmission technology is expected to improve performance in terms of both an increase in cell radius by beamforming and an increase in data rate by spatial multiplexing.
  • various signals (uplink signals) transmitted on the uplink channel (uplink channel) of the cellular communication system include, for example, Periodic Sounding Reference Signal (hereinafter referred to as P-SRS), Aperiodic SRS (hereinafter referred to as A-). SRS), a signal transmitted on an uplink control channel (PUCCH: Physical-Uplink-Control-CHannel) (uplink control signal; hereinafter referred to as PUCCH signal), and an uplink data channel (PUSCH: Physical-Uplink-Shared-CHannel) (Uplink data signal; hereinafter referred to as a PUSCH signal).
  • P-SRS Periodic Sounding Reference Signal
  • A- Aperiodic SRS
  • SRS Signal transmitted on an uplink control channel
  • PUCCH Physical-Uplink-Control-CHannel
  • PUSCH Physical-Uplink-Shared-CHannel
  • P-SRS is a channel quality measurement reference signal transmitted periodically
  • A-SRS is a channel quality measurement reference signal transmitted aperiodically in response to an instruction from the base station.
  • the PUCCH is a control channel for transmitting a response signal (ACK / NACK signal) corresponding to a demodulation result of downlink data (link from the base station to the terminal, downlink), downlink channel quality information, or the like.
  • the PUSCH is a data channel for transmitting uplink data (uplink data).
  • the above-described reference signal (P-SRS or A-SRS) and data need to be related to each other.
  • the base station applies frequency resource allocation based on the result of observing the P-SRS transmitted from the terminal, sets the frequency resource used for transmitting the PUSCH signal (uplink data) of the terminal, and Apply precoding control based on Codebook to control the beam in a closed loop.
  • SINR Signal-to-Interference-and-Noise-Ratio
  • the terminal when the number of antenna ports smaller than the number of antenna ports included in the terminal is set for transmission of a certain uplink signal, the terminal has more than the set number of antenna ports under its own responsibility.
  • the uplink signal can be transmitted using the antenna port.
  • the terminal allocates the P-SRS to each physical antenna (Physical antenna) using ImplementationIbased precoding when transmitting P-SRS (for example, using one antenna port 10).
  • ImplementationIbased precoding the operation using only the antenna port that observed a strong signal (signal with good reception quality) based on the observation result of the downlink signal, or the power distribution according to the ratio of the received power The operation to do is mentioned.
  • LTE-Advanced uplink which is an extension of LTE
  • a terminal having a plurality of antenna ports is supported as in the above-described MIMO transmission in the uplink, and closed-loop precoding control is introduced.
  • precoding control based on a specified Codebook is applied. For this reason, the reproducibility in the amplitude and phase of the signal generated at the terminal is increased between the time observed when precoding is determined by the base station and the time of data transmission by precoding at the terminal. Is desired. If this reproducibility is low, the signals of each antenna port are combined on the receiving side (base station) and observed, the intended combining operation cannot be performed. There is also concern that it will be done.
  • Non-Patent Document 1 In order to reduce the influence on the combining processing on the base station side, as described in Non-Patent Document 1, relative to each antenna port over a plurality of subframes with respect to a terminal supporting uplink MIMO transmission. It has been studied to specify the phase accuracy.
  • the relative phase error (signal component in the focused subframe, which affects the securing of relative phase accuracy, and It is necessary to consider the error in the phase component from the signal component at the time of the previous transmission (hereinafter referred to as RPC (Relative Phase Continuity) error). If a disturbance factor due to an unexpected phase rotation caused by the RPC error is added to the precoding control, the base station cannot perform PUSCH precoding control, frequency resource allocation, MCS selection, and the like with high accuracy. Will deteriorate.
  • PA PowerifierAmplifier
  • the point to be considered regarding the RPC error is that the RPC error becomes larger as the transmission time interval of the uplink signal is longer. Specifically, since the temperature of the terminal PA changes with the passage of time, the amplification characteristics of the PA change with the passage of time. Therefore, the longer the uplink signal transmission time interval, the greater the degree of change in the PA amplification characteristics at the terminal. That is, it is assumed that the RPC error becomes larger as the uplink signal transmission time interval is longer.
  • the RPC error becomes larger as the transmission power change amount (hereinafter referred to as ⁇ P) from the previous transmission (at the time of the previous transmission) is larger.
  • ⁇ P transmission power change amount
  • a terminal in which a multi-stage PA is mounted as an amplifier circuit an increase or decrease in the number of PA stages used when amplifying transmission power increases as ⁇ P increases. That is, as ⁇ P increases, the increase / decrease in the number of stages of PA increases, so the error in each stage of PA is added, and the RPC error becomes larger.
  • the transmission power is proportional to the frequency bandwidth of the transmission signal
  • the greater the ⁇ P the greater the increase / decrease in transmission power
  • the change in the frequency position and bandwidth of the transmission signal since the amplification characteristic of PA also depends on the frequency (frequency position and bandwidth), the larger the ⁇ P (the greater the increase / decrease in frequency position and bandwidth), the greater the RPC error.
  • FIG. 2 shows the definition of the allowable range of TPC error when the elapsed time (transmission gap) from the previous uplink signal transmission is longer than 20 ms (transmission gap> 20 ms). That is, as shown in FIG. 2, when the elapsed time is longer than 20 ms, a TPC error within a range of ⁇ 9.0 dB is allowed.
  • TPC Transmission Power Control
  • FIG. 3 shows the definition of the allowable range of the TPC error when the elapsed time from the previous uplink signal transmission is 20 ms or less (transmission gap ⁇ 20 ms). As shown in FIG. 3, when the elapsed time is within 20 ms, the allowable range of the TPC error is larger as the transmission power change amount (power step) ⁇ P is larger.
  • the terminal performs phase control so that the phase fluctuation between the previous transmission and the current transmission is within a predetermined RPC error.
  • the terminal gives a phase rotation that removes the phase difference.
  • FIG. 4 shows an example of the definition of the allowable range of the RPC error when the elapsed time (transmission) gap) from the previous uplink signal transmission is larger than 20 ms (transmission gap> 20 ms). That is, as shown in FIG.
  • a different number of antenna ports can be set for each uplink signal, so that a continuous uplink signal (for example, the uplink signal transmitted immediately before and the uplink signal transmitted this time) Even if the transmission time interval is within 20 ms, the number of antenna ports used when transmitting each uplink signal may be different. Therefore, even if a different number of antenna ports is set for each uplink signal, and the allowable range of RPC error is defined as shown in FIG. 4, for example, the transmission time of the uplink signal for defining the allowable RPC error in phase control There are cases where the interval cannot be properly specified.
  • a terminal has two antenna ports, one antenna port (Port 10) is set for transmitting a P-SRS signal, and two antenna ports (Port 20, 21) are used for transmitting PUSCH.
  • a P-SRS signal is transmitted at time t1 (previous transmission)
  • a PUSCH is transmitted at time t2 (current transmission)
  • each uplink signal is transmitted from time t1 to time t2.
  • the elapsed time (transmission time interval) T is up to 20 ms.
  • the RPC error is small when the elapsed time (transmission time interval) T is 20 ms or less, and the RPC error is large when the elapsed time T is longer than 20 ms.
  • the set number of antenna ports differs between the P-SRS signal transmitted at time t1 and the PUSCH transmitted at time t2. For this reason, of the two antenna ports provided in the terminal, one antenna port is not used during transmission of the P-SRS signal (that is, during previous transmission). That is, at the terminal, for example, similar to the TPC error (FIGS. 2 and 3), the allowable RPC error when the elapsed time is longer than 20 ms (for example, FIG. 4) and the allowable RPC error when the elapsed time is within 20 ms. When the rule (not shown) is used, the transmission time interval at the antenna port that was not used at the previous transmission is not considered.
  • An object of the present invention is to provide a transmission apparatus and a transmission method capable of avoiding an increase in apparatus cost due to required RPC accuracy even when different numbers of antenna ports are set for transmission of each uplink signal.
  • a transmission apparatus includes a control unit that controls a phase of a signal, and a transmission unit that transmits the signal through the at least one antenna port at the controlled phase.
  • the control unit controls the phase based on a comparison between the number of the at least one antenna port and the number of antenna ports used for the previous transmission.
  • a transmission method is a transmission method for controlling a phase of a signal and transmitting the signal through the at least one antenna port with the controlled phase.
  • the phase is controlled based on a comparison between the number of antenna ports and the number of antenna ports used for the previous transmission.
  • the figure which shows the setting and precoding processing of the number of antenna ports The figure which shows a response
  • compatibility with a transmission time interval and the allowable range of RPC error Diagram for explaining the problems of the prior art The block diagram which shows the main structures of the terminal which concerns on Embodiment 1 of this invention.
  • the block diagram which shows the structure of the terminal which concerns on Embodiment 3 of this invention.
  • the figure which shows the example of a setting of the phase compensation which concerns on Embodiment 3 of this invention The figure which shows a response
  • P-SRS, A-SRS, PUCCH signal, and PUSCH signal will be described as uplink signals, but the uplink signals are not limited to these.
  • the number of antenna ports used for transmission of P-SRS, A-SRS, PUCCH signal, and PUSCH signal is individually set. It is assumed that the number of antenna ports for each uplink signal is set semi-static and does not change for several hundred milliseconds to several seconds. That is, here, the number of antenna ports used for transmission of the uplink signal is specified by the type of the uplink signal.
  • FIG. 6 shows the main configuration of the terminal according to the present embodiment.
  • phase compensation control section 109 controls the phase of the signal
  • transmission RF sections 108-1 and 108-2 send the signal with the controlled phase via at least one antenna port.
  • the phase compensation control unit 109 controls the phase based on a comparison between the number of at least one antenna port and the number of antenna ports used for the previous transmission.
  • FIG. 7 shows the configuration of terminal 100 according to the present embodiment.
  • transmission processing sections 101-1 and 101-2 are provided corresponding to the number of antenna ports that can be used in terminal 100, respectively.
  • Transmission RF sections 108-1 and 108-2 are provided according to the number of antennas 112-1 and 112-2 (physical antennas), respectively. That is, here, as shown in FIG. 7, terminal 100 can transmit a signal using a maximum of two antenna ports.
  • terminal 100 includes two PAs corresponding to antennas 112-1 and 112-2, respectively.
  • One antenna port is assumed to be composed of one or a plurality of physical antennas.
  • Each transmission processing unit 101 mainly includes a generation unit 102, a mapping unit 103, an IFFT (InverseInFourier Transform) unit 104, a CP (Cyclic Prefix) adding unit 105, and a transmission power control unit 106. .
  • IFFT InverseInFourier Transform
  • CP Cyclic Prefix
  • the generation unit 102 generates an uplink signal transmitted from the terminal 100, and outputs the generated uplink signal to the mapping unit 103.
  • the generation unit 102 when generating P-SRS or A-SRS as a reference signal, the generation unit 102 generates an RS sequence (for example, a ZC (Zadoff-Chu) sequence), and a cyclic shift amount (indicated by the base station) A phase rotation corresponding to CS (Cyclic Shift) amount is given to the RS series.
  • the generation unit 102 when generating the PUCCH signal as the control signal, the generation unit 102 performs channel coding on a CQI (Channel Quality Indicator) report signal or an HARQ (Hybrid Automatic Transmission Request) ACK / NACK signal, etc. And apply modulation. Further, when generating the PUSCH signal as uplink data (data signal), the generation unit 102 uses the transport block size, the coding rate, and the modulation scheme instructed by the base station for the uplink data, respectively. Encode, rate match and modulate.
  • CQI Channel Quality Indicator
  • HARQ Hybrid Automatic Transmission Request
  • Mapping section 103 maps the signal (RS sequence, control signal, or uplink data) input from generation section 102 to the frequency resource based on the frequency resource allocation information instructed from the base station, and outputs it to IFFT section 104 .
  • the IFFT unit 104 performs IFFT processing on the signal input from the mapping unit 103, and outputs the signal after IFFT processing to the CP adding unit 105.
  • CP adding section 105 adds the same signal as the tail part of the signal after IFFT inputted from IFFT section 104 to the head as CP, and outputs the signal after CP addition to transmission power control section 106.
  • the transmission power control unit 106 controls the transmission power of the signal (uplink signal) input from the CP adding unit 105 according to the transmission power control value instructed from the base station, and the signal after the transmission power control is precoded unit 107. Output to.
  • the precoding unit 107 performs precoding processing on the signals input from the transmission processing units 101-1 and 101-2 (that is, signals corresponding to the respective antenna ports) in the same manner as in FIG. For example, when transmitting a signal that uses one antenna port, the precoding unit 107 distributes the signal to each physical antenna using Implementation based precoding. In this case, the signal is transmitted by the two antennas 112-1 and 112-2. In addition, a signal that does not support precoding among signals using one antenna port is not subjected to precoding processing. In this case, the signal is transmitted from either one of the two antennas 112-1 and 112-2.
  • the precoding unit 107 performs codebook-based precoding on signals transmitted from a plurality of antenna ports (two antenna ports). Then, precoding section 107 outputs the precoded signal to transmission RF sections 108-1 and 108-2, respectively.
  • the phase compensation control unit 109 includes a calculation unit 110 and a phase compensation determination unit 111.
  • the phase compensation control unit 109 controls the phase of the uplink signal transmitted this time based on the comparison between the number of antenna ports used for transmission of the uplink signal transmitted this time and the number of antenna ports used for the previous transmission.
  • the calculation unit 110 of the phase compensation control unit 109 transmits the uplink signal (PUSCH signal, PUCCH signal, or SRS (P-SRS, A-SRS)) transmitted immediately before (previous transmission) by the terminal 100.
  • the elapsed time from is calculated.
  • the calculation unit 110 calculates the number of antenna ports used when transmitting the uplink signal transmitted immediately before (previous transmission) at the terminal 100 and the number of antenna ports used when transmitting the uplink signal transmitted this time from the terminal 100. Calculate the magnitude relationship.
  • the calculation unit 110 outputs the calculated relationship between the elapsed time and the number of antenna ports to the phase compensation determination unit 111.
  • the phase compensation determination unit 111 of the phase compensation control unit 109 uses a phase compensation method to be applied when generating an uplink signal transmitted from the terminal 100 according to the magnitude relationship between the elapsed time input from the calculation unit 110 and the number of antenna ports. Set. Then, phase compensation determination section 111 outputs the phase compensation method to transmission RF sections 108-1 and 108-2. Details of the phase compensation method setting process in the phase compensation determination unit 111 will be described later.
  • Transmission RF sections 108-1 and 108-2 perform transmission processing such as D / A conversion, up-conversion and amplification on the signal input from precoding section 107, and are instructed by phase compensation control section 109. A phase compensation method is applied, and the signal after transmission processing is transmitted from the antenna 112. Thus, in terminal 100, the uplink signal is transmitted via at least one antenna port with the phase controlled by phase compensation control section 109.
  • FIG. 8 shows the configuration of base station 200 according to the present embodiment.
  • the reception RF unit 202 receives a signal transmitted from the terminal 100 (FIG. 7) via the antenna 201, and performs reception processing such as down-conversion and A / D conversion on the received signal. I do.
  • the signal transmitted from terminal 100 includes each uplink signal (for example, PUCCH signal, PUSCH signal, or SRS (P-SRS, A-SRS)).
  • reception RF section 202 outputs the signal after reception processing to CP removal section 203.
  • CP removing section 203 removes the CP added to the head of the signal inputted from reception RF section 202 and outputs the signal after CP removal to FFT (Fast Fourier Transform) section 204.
  • FFT Fast Fourier Transform
  • the FFT unit 204 performs an FFT process on the signal input from the CP removal unit 203 to convert the signal into a frequency domain signal, and outputs the frequency domain signal to the demapping unit 205.
  • the demapping unit 205 determines the desired value from the frequency domain signal input from the FFT unit 204. A signal corresponding to the transmission band (frequency resource) of the terminal is extracted. Then, the demapping unit 205 outputs the extracted signal (SRS, PUCCH signal, or PUSCH signal) to the corresponding components of the SRS SINR measurement unit 208, the PUCCH resource detection unit 210, and the PUSCH demodulation unit 212, respectively. To do.
  • the cyclic shift amount setting unit 206 outputs the cyclic shift amount for the desired terminal, which is instructed by the base station 200 to the terminal 100 (desired terminal), to the SRS SINR measurement unit 208.
  • the phase compensation setting unit 207 performs the same processing as the phase compensation control unit 109 of the terminal 100. That is, the phase compensation setting unit 207 includes the elapsed time from the transmission time of the uplink signal transmitted immediately before (previous transmission) from the terminal 100 (desired terminal), and the antenna port between the previous transmission and the current transmission. A phase compensation method for each uplink signal is set according to the magnitude relationship. Then, the phase compensation setting unit 207 outputs the set phase compensation method to the data SINR derivation unit 209, the PUCCH demodulation unit 211, and the PUSCH decoding unit 213, respectively. Details of setting processing of the allowable RPC error ⁇ phase in the phase compensation setting unit 207 will be described later.
  • SIRS measurement unit for SRS 208 complex-divides the SRS (P-SRS or A-SRS) input from demapping unit 205 and the RS sequence known between transmission and reception to obtain a correlation signal in the frequency domain. . Furthermore, the SNR SINR measurement unit 208 performs an IDFT (Inverse Discrete Fourier Transform) process on the frequency domain correlation signal to calculate a time domain correlation signal (that is, a delay profile). This delay profile includes SRSs (reference signals) of a plurality of terminals. Therefore, the SIRS SINR measurement unit 208 uses the cyclic shift amount of the desired terminal input from the cyclic shift amount setting unit 206 to mask other than the portion corresponding to the cyclic shift amount of the desired terminal in the delay profile. Thus, the SNR SINR measurement value (SRS SINR measurement value) of the desired terminal is calculated. Then, the SRS SINR measurement unit 208 outputs the calculated SRS SINR measurement value to the data SINR deriving unit 209.
  • IDFT Inverse Discrete
  • the data SINR deriving unit 209 uses the SRS SINR measurement value input from the SRS SINR measurement unit 208 and the phase compensation method input from the phase compensation setting unit 207 to perform uplink data (that is, PUSCH signal). SINR (data SINR measurement value) is derived. Specifically, data SINR deriving unit 209 uses the SRS for SINR measurements and the allowable RPC error delta phase, according to the following equation (1), to derive data for SINR measurement. Equation (1), for tolerance RPC error delta phase, - representing the operation of the maximum value by comparing the '10 dB'.
  • equation (1) shows a case where the minimum value of the value to be subtracted by the phase compensation method ( '-10 dB') is set.
  • the minimum value is set to “ ⁇ 10 dB” here, the present invention is not limited to this, and the base station 200 may set an arbitrary value in a negative region.
  • the base station 200 performs scheduling (for example, frequency resource allocation and MCS selection) of the terminal 100 using the data SINR measurement value derived by the data SINR deriving unit 209.
  • the PUCCH resource detection unit 210 performs despreading processing on the PUCCH signal input from the demapping unit 205 using the cyclic shift amount and spreading code assigned to the desired terminal, and assigns the PUCCH signal from the desired terminal.
  • the detected PUCCH resource is detected.
  • the PUCCH resource detection unit 210 outputs the PUCCH signal to the PUCCH demodulation unit 211.
  • the PUCCH demodulation unit 211 performs demodulation processing on the PUCCH signal input from the PUCCH resource detection unit 210, and extracts the demodulated PUCCH signal as a PUCCH demodulated signal.
  • the PUSCH demodulation unit 212 performs demodulation processing on the PUSCH signal input from the demapping unit 205 based on the modulation scheme instructed to the desired terminal, and outputs the demodulated PUSCH signal to the PUSCH decoding unit 213.
  • the PUSCH decoding unit 213 performs a decoding process on the PUSCH signal input from the PUSCH demodulating unit 212 based on the coding rate instructed to the desired terminal, and extracts the decoded PUSCH signal as PUSCH decoded data.
  • phase compensation control unit 109 (FIG. 7) of the terminal 100 and the phase compensation setting unit 207 (FIG. 8) of the base station 200 will be described.
  • the case where the elapsed time (transmission time interval) T from the transmission time of the uplink signal transmitted last time to the transmission time of the uplink signal transmitted this time is 20 ms or less is set as the case where the RPC error is small, and the elapsed time T is 20 ms.
  • the longer case is the case where the RPC error is large.
  • FIG. 9A 2 antenna ports (Port 20-20) are set for transmission of P-SRS signals, and 1 antenna port (Port 10) is set for transmission of PUSCH.
  • FIG. 9B two antenna ports (Port 20, 21) are set for transmission of P-SRS signals, and two antenna ports (Port 20-21) are set for transmission of PUSCH.
  • one antenna port is used, at least one of the antennas 112-1 and 112-2 of the terminal 100 is used.
  • the antenna 112- of the terminal 100 is used. Both 1 and 112-2 are used.
  • the calculation unit 110 of the phase compensation control unit 109 transmits the previous uplink signal (PUSCH in FIGS. 9A and 9B) from the transmission time t1 of the immediately previous (previous) uplink signal (P-SRS signal in FIGS. 9A and 9B).
  • the calculation unit 110 calculates the magnitude relationship between the number of antenna ports used for transmission at time t1 and the number of antenna ports used for transmission at time t2. That is, the calculation unit 110 compares the number of antenna ports (at least one antenna port) used at the time of the current transmission with the number of antenna ports used for the previous transmission. For example, in FIG. 9A, the calculation unit 110 calculates that the number of antenna ports (one) used at time t2 is smaller than the number of antenna ports (two) used at time t1. On the other hand, in FIG. 9B, calculation unit 110 calculates that there are a plurality of antenna ports (two) used at time t1 and a plurality of antenna ports (two) used at time t2. In other words, in FIG. 9B, calculation unit 110 calculates that the number of antenna ports (two) used at time t2 is plural, and that the number of antenna ports used at time t1 and time t2 is the same.
  • Phase compensation determination unit 111 based on the calculated transmission magnitude of the time interval T and the number of antenna ports at the calculator 110, according to the table shown in FIG. 10, for example, to determine the permissible RPC error delta phase. Further, the phase compensation determining section 111, from the determined allowable RPC error delta phase, to determine the phase compensation method. As described above, the phase compensation control unit 109 determines the phase of the uplink signal based on the comparison between the number of antenna ports used for the current transmission (at least one antenna port) and the number of antenna ports used for the previous transmission. To control.
  • the transmission RF units 108-1 and 108-2 perform phase compensation based on the phase compensation method and the allowable RPC error input from the phase compensation determination unit 111.
  • the number of antenna ports used is one. Therefore, at time t2, precoding control according to the instruction of base station 200 is not applied in terminal 100. That is, at time t2, terminal 100 does not have to consider precoding control. Therefore, even if the RPC error increases, it can be considered that the RPC error has no influence on the combining operation by the precoding control intended by the base station 200.
  • the base station 200 when the number of antenna ports (one) used at time t1 is smaller than the number of antenna ports (two) used for transmission of uplink signals transmitted at time t2 (not shown), the base station 200 The number of antenna ports (one) used for the reference signal (for example, P-SRS at time t1) observed when precoding is determined in FIG. Specifically, at time t1, base station 200 observes the reference signal only at one of the two antenna ports used at time t2, and does not observe the reference signal at the other antenna port. As a result, the accuracy of the precoding control at time t2 is inevitably low. That is, the accuracy of precoding control at time t2 is low regardless of the magnitude of the RPC error caused by the transmission time interval T or the like. For this reason, even if the RPC error increases, it can be considered that the RPC error has little influence on the combining operation by the precoding control intended by the base station 200.
  • the reference signal for example, P-SRS at time t1
  • the phase compensation determination unit 111 uses the number of antenna ports used for transmission of the uplink signal transmitted at time t1 when the transmission time interval T is longer than 20 msec (not shown) or When the number of antenna ports used for transmission of the uplink signal transmitted at time t2 is singular (for example, FIG. 9A), the allowable RPC error ⁇ phase is set to ⁇ [deg] (a value larger than ⁇ ).
  • the number of antenna ports used is plural (two), and a plurality of PAs corresponding to antennas 112-1 and 112-2 provided in terminal 100 are used.
  • the phase compensation determination unit 111 transmits the transmission time interval T within 20 msec and the number of antenna ports used for transmitting the uplink signal transmitted at time t1 and the time t2.
  • the allowable RPC error ⁇ phase is set to ⁇ [deg] (a value smaller than ⁇ ).
  • the phase compensation determination unit 111 specifies a phase compensation method for achieving the obtained allowable RPC error ⁇ phase ( ⁇ or ⁇ ), and instructs the transmission RF units 108-1 and 108-2.
  • the terminal 100 uses the phase component j (t1) in the signal component at time t1 (black point on the complex plane at time t1 shown in FIG. 9B) and the signal component at time t2 (on the complex plane at time t2 shown in FIG. 9B). And the phase component j (t2) at the signal component (black point on the complex plane at time t2 shown in FIG. 9B) obtained by canceling the phase component of the precoding and transmission signal sequence To do.
  • the purpose of comparing signals in which the phase components of precoding and transmission signal series are offset is to eliminate as much as possible the influence other than the amount of phase change caused by PA characteristics.
  • phase compensation processing is performed by assigning a phase rotation amount ⁇ -j (t2-t1) ⁇ to.
  • the terminal 100 does not perform phase compensation processing on the transmission signal.
  • the terminal 100 pre-codes the signal component at time t1 (black point on the complex plane at time t1 shown in FIG. 9A) in which quadrant is located in the complex plane and the signal component at time t2. And the information indicating in which quadrant the signal component (black point on the complex plane at time t2 shown in FIG. 9A) in which the phase component of the transmission signal sequence is located is compared.
  • the terminal 100 sets any value of j, ⁇ 1, ⁇ j to the time t2 so that the signal component at the time t2 is located in the same quadrant as the signal component at the time t1 only when both are in different quadrants. Is multiplied by the signal component. For example, in FIG.
  • the terminal 100 multiplies the signal component at time t2 (third quadrant) by ⁇ j, so that the signal component at time t2 is quadrant (second quadrant) where the signal component at time t1 is located. Shift to. On the other hand, the terminal 100 does not perform phase compensation processing when both are located in the same quadrant.
  • the phase compensation setting unit 207 of the base station 200 transmits the uplink signal transmission time interval for each terminal 100 and the previous transmission time and the current transmission time for each terminal 100.
  • the phase compensation method is set based on the magnitude relationship of the number of antenna ports between and.
  • phase compensation control unit 109 (phase compensation determination unit 111) performs the phase compensation process according to the above-described allowable RPC error not only for the PUSCH but also for the phase compensation control for the PUCCH and the SRS.
  • the terminal 100 controls the phase of the uplink signal based on the elapsed time (transmission time interval) from the previous transmission. Further, terminal 100 (phase compensation control unit 109) compares the number of antenna ports used at the time of the current transmission with the number of antenna ports used for the previous transmission of a predetermined time interval (20 ms in this case) or less. Based on the above, the phase of the upstream signal is controlled.
  • terminal 100 varies the phase compensation method for each uplink signal (PUCCH signal, PUSCH signal, and SRS) according to transmission conditions. Specifically, the terminal is based on the elapsed time from the previous transmission (transmission time interval) and the magnitude relationship between the number of transmission antenna ports used at the previous transmission and the number of transmission antenna ports used at the current transmission.
  • the phase of the uplink signal is controlled by setting the phase compensation method and the allowable RPC error.
  • a terminal having a plurality of antennas for example, a terminal that performs MIMO transmission
  • transmission of the uplink signal using each antenna port is performed.
  • the RPC error based on the time interval can be specified appropriately. Therefore, according to the present embodiment, it is possible to prevent deterioration in SINR measurement accuracy due to RPC errors in the base station even when different numbers of antenna ports are set for transmission of each uplink signal.
  • terminal 100 phase compensation control unit 109) has a case where transmission time interval T is short (in this case, T) ⁇ 20 ms) and there are a plurality of antenna ports at both the previous transmission and the current transmission.
  • T transmission time interval
  • the allowable RPC error is controlled to be small.
  • the terminal 100 is used for the current transmission when the number of antenna ports used for the current transmission (at least one antenna port) or the number of antenna ports used for the previous transmission is singular.
  • a large allowable RPC error ( ⁇ in FIG. 10) is set as compared with the case where the number of antenna ports is plural and the number of antenna ports used for the previous transmission is plural.
  • the terminal 100 is expected to have a small allowable RPC error, and an allowable RPC error for signal transmission in which the allowable RPC error is expected to be large compared to the allowable RPC error for signal transmission to which precoding control is applied. To make it larger. As a result, the terminal 100 can more easily perform the phase compensation process for the uplink signal that is expected to have a large allowable RPC error compared to the phase compensation process for the uplink signal that is expected to have a small allowable RPC error. It becomes. Therefore, the terminal can control signal transmission that is expected to have a large allowable RPC error at a minimum device cost required to obtain a desired RPC error.
  • Terminal 100 has a phase difference between the signal component at time t2 and the signal component at time t1 (that is, the relative phase between the phase at the signal at time t2 and the phase at the transmission at time t1).
  • the phase of the signal component at time t2 is controlled so as to be within the set allowable RPC error ⁇ phase. That is, the terminal 100 (phase compensation control unit 109), when the phase difference between the signal component of the signal component and the time t1 and time t2 becomes the allowable RPC error delta phase out that is set within the allowable RPC error delta phase
  • phase rotation is applied to the phase of the signal component at time t2.
  • a high-accuracy phase compensation method that is, a method with a large amount of processing
  • a low-precision phase compensation method that is, a method with a small amount of processing
  • the base station 200 performs high-accuracy limited to the operation at multiple antenna ports (FIG. 9B) suitable for expanding the cell radius by applying precoding control and increasing the data rate by spatial multiplexing. It is possible to apply phase compensation and apply coarse phase compensation (low-precision phase compensation) in other situations (for example, FIG. 9A). Therefore, it is possible to minimize the device cost at the terminal 100 while ensuring the possibility that the base station 200 can perform precoding control.
  • the present embodiment it is possible to suppress the increase in the device cost of the terminal while preventing the deterioration of the SINR measurement accuracy due to the RPC error in the base station. That is, according to the present embodiment, it is possible to avoid an increase in apparatus cost due to required RPC accuracy even when different numbers of antenna ports are set for transmission of each uplink signal.
  • the elapsed time T and the magnitude relationship between the number of antenna ports is shown in FIG. 10, when the pre-defined in the system associates the permissible RPC error delta phase, for phase compensation of the uplink signal Signaling for each transmission becomes unnecessary.
  • the parameter is relatively long cycle, Alternatively, it is only necessary to notify the terminal once, and signaling for each transmission for phase compensation of the uplink signal becomes unnecessary. Therefore, in these cases, an increase in signaling overhead required for phase compensation of the uplink signal can be suppressed.
  • the case where PUSCH was transmitted at the time t2 and P-SRS was transmitted at the time t1 was demonstrated.
  • the terminal 100 uses the number of antenna ports used last time (time t1) for transmission of another uplink signal (PUCCH signal, P-SRS or A-SRS) different from the uplink signal (PUSCH) transmitted at time t2, Even when the phase compensation of the uplink signal is controlled based on the comparison with the number of antenna ports used for transmission of the uplink signal transmitted this time (time t2), the same effect as the present embodiment can be obtained. it can.
  • base station 200 may have a configuration in which a plurality of reception antennas are provided, and components of each reception antenna may be demapped. After being taken out in 205, the SRS SINR measurement unit 208 may synthesize it.
  • terminal 100 determines a phase compensation method based on whether the number of antenna ports at time t1 or time t2 is singular or plural.
  • the present invention is not limited to this, and it is assumed that the terminal 100 uses a plurality of antenna ports at both time t1 and time t2, and when the number of antenna ports differs between time t1 and time t2, Compared to the case where the number of antenna ports is the same at time t2, it may be configured to set a large allowable RPC error.
  • the terminal 100 has antennas at time t1 and time t2 when the number of antenna ports is different between time t1 and time t2. It is determined that the assumed RPC error is larger than when the number of ports is the same.
  • terminal 100 assumes that a plurality of antenna ports are used at both time t1 and time t2, and the number of antenna ports at time t2 is greater than the number of antenna ports used for the previous transmission.
  • a configuration may be adopted in which a large allowable RPC error is set as compared with a case where the number of antenna ports at time t2 is the same as or smaller than the number of antenna ports used for the previous transmission. That is, when a plurality of antenna ports are used at time t1 and time t2, terminal 100 has a case where the number of antenna ports at time t2 is larger than the number of antenna ports used for the previous transmission.
  • the assumed RPC error is larger than when the number of antenna ports at time t2 is the same as or smaller than the number of antenna ports used for the previous transmission.
  • the terminal 100 uses a plurality of antenna ports at both time t1 and time t2, and the antenna port at time t2 includes an antenna port that was not used in the previous transmission
  • the antenna port at time t2 includes only the antenna port used for the previous transmission
  • a configuration may be adopted in which a large allowable RPC error is set. That is, when a plurality of antenna ports are used at time t1 and time t2 and the number of antenna ports used is the same, terminal 100 has not used the antenna port at time t2 in the previous transmission. It is determined that the assumed RPC error is larger than the case where the antenna port at time t2 includes only the antenna port used in the previous transmission than when the antenna port is included.
  • terminal 100 can more accurately identify the RPC error even when a plurality of antenna ports are used at both time t1 and time t2. Therefore, compared with the present embodiment, terminal 100 can perform more appropriate phase compensation processing, and can further suppress an increase in device cost of terminal 100.
  • the terminal in addition to the processing of the first embodiment, further permits the signal transmitted this time based on the transmission power of the signal transmitted last time and the transmission power of the signal transmitted this time.
  • RPC error is specified and phase compensation is performed.
  • the PUSCH is transmitted from the terminal in accordance with an instruction indicated on a downlink control channel (PDCCH: Physical-Downlink-Control-CHannel) transmitted from the base station.
  • PDCCH Physical-Downlink-Control-CHannel
  • the PDCCH includes control information related to PUSCH allocation, TPC commands (control values, for example, +3 dB, +1 dB, 0 dB, ⁇ 1 dB), and precoding control information.
  • the terminal transmits a PUSCH signal along the instruction content from the base station indicated by the control information.
  • a P-SRS signal is transmitted at time t1 and PUSCH is transmitted at time t2 after time t1.
  • the number of antenna ports is defined semi-statically for P-SRS.
  • signals transmitted at time t1 and time t2 are not limited to P-SRS and PUSCH signals.
  • FIG. 11 shows the configuration of terminal 300 according to the present embodiment.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • PDCCH detection section 301 detects a downlink control channel (PDCCH) as control information (data allocation information) related to PUSCH allocation.
  • PDCCH detection unit 301 detects control information related to PUSCH allocation
  • the PDCCH detection unit 301 outputs a transport block size, a coding rate, and a modulation scheme indicated by the base station, which are indicated in the control information, to the generation unit 102 (see FIG.
  • the frequency resource allocation information is output to the mapping unit 103 (not shown), and the TPC command is output to the transmission power control unit 106 (not shown).
  • terminal 300 assumes two formats as the format of control information detected by PDCCH detection section 301 (sometimes referred to as DCI format).
  • the first is control that can include information on the transport block size, coding rate, and modulation scheme while supporting codebook-based precoding as control information corresponding to transmission by a plurality of antenna ports.
  • This is an information format (hereinafter referred to as Format 4 or sometimes referred to as DCIDformat 4).
  • the second is a control information format that does not support precoding as control information corresponding to transmission by a single antenna and includes only one piece of information on a transport block size, a coding rate, and a modulation scheme (hereinafter referred to as “control information format”). , Called Format 0, or sometimes called DCI format 0).
  • the PDCCH detection unit 301 outputs information indicating whether the detected control information corresponds to Format IV4 or Format IV0 to the calculation unit 303 of the phase compensation control unit 109.
  • the calculation unit 303 of the phase compensation control unit 109 calculates the elapsed time from the transmission immediately before the uplink signal at the terminal 300, and transmits the uplink signal (previous transmission) transmitted immediately before at the terminal 300 (The magnitude relationship between the number of antenna ports used when transmitting (P-SRS signal) and the number of antenna ports used when transmitting the uplink signal (PUSCH) transmitted this time from terminal 300 is calculated.
  • the calculation unit 303 calculates the size relationship of the number of antenna ports, if the information input from the PDCCH detection unit 301 is Format 4 (data allocation information for a plurality of antenna ports), It is determined that two antenna ports (that is, the maximum number of antenna ports that can be used in terminal 300) are used for transmission of the PUSCH signal transmitted last time. On the other hand, if the information input from PDCCH detection unit 301 is Format 0 (data allocation information for one antenna port), calculation unit 303 determines that only one antenna port is used for transmission of the previously transmitted PUSCH signal. To do.
  • the calculation unit 303 can specify the magnitude relationship between the number of antenna ports used for PUSCH signal transmission and the number of antenna ports used for P-SRS transmission based on the PDCCH format type. it can. Then, the calculation unit 303 outputs the calculated relationship between the elapsed time and the number of antenna ports to the phase compensation determination unit 304.
  • the phase compensation determination unit 304 of the phase compensation control unit 109 determines the terminal in accordance with the magnitude relationship between the elapsed time and the number of antenna ports input from the calculation unit 303 and the transmission power ratio input from the transmission power information acquisition unit 302. A phase compensation method to be applied when generating an uplink signal transmitted from 300 is set.
  • FIG. 12 shows the configuration of base station 400 according to the present embodiment.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the base station 400 shown in FIG. 12 prepares at least two formats (DCI format) of control information used for PUSCH signal allocation, similarly to the terminal 300 (FIG. 11). That is, the first is the above-described Format 4, and the second is the above-described Format 0.
  • the PDCCH generation unit 401 generates a PDCCH including control information used for PUSCH signal allocation. Also, the PDCCH generation unit 401 outputs information indicating whether the control information used for PUSCH signal allocation corresponds to Format 4 or Format 0 to the phase compensation setting unit 403.
  • the SRS control information generation unit 402 sets the transmission power of P-SRS and A-SRS assigned to each terminal 300, and generates SRS control information indicating the set transmission power. Then, SRS control information generation section 402 notifies each terminal 300 of the generated SRS control information (not shown) and outputs it to phase compensation setting section 403.
  • phase compensation setting unit 403 performs the same processing as the phase compensation control unit 109 of the terminal 300. That is, phase compensation setting section 403 is the elapsed time from the transmission time of the P-SRS signal transmitted immediately before (previous transmission) from terminal 300 (desired terminal), information input from PDCCH generation section 401 (PDCCH format) Type) and the phase compensation method for PUSCH are set according to the SRS control information input from SRS control information generation section 402. That is, phase compensation setting section 403 determines that two antenna ports (all antenna ports included in terminal 300) are used for PUSCH transmission when the information input from PDCCH generating section 401 is Format IV4.
  • phase compensation setting unit 403 determines that only one antenna port is used for PUSCH transmission when the information input from the PDCCH generation unit 401 is Format 0. Further, phase compensation setting section 403 calculates a ratio ⁇ P ′ between the SRS control information (P-SRS signal transmission power) input from SRS control information generation section 402 and the PUSCH transmission power transmitted from terminal 300. To do. Then, phase compensation setting section 403 sets the PUSCH phase compensation method based on the determination result of the number of antenna ports used for PUSCH transmission and the ratio of transmission power.
  • the data SINR deriving unit 209 uses the SRS SINR measurement value input from the SRS SINR measurement unit 208 and the phase compensation method input from the phase compensation setting unit 403 to perform uplink.
  • the SINR (data SINR measurement value) of data (that is, PUSCH signal) is derived.
  • the data SINR derivation unit 209 derives the data SINR measurement value according to the equation (1) using the SRS SINR measurement value and the phase error ⁇ corresponding to the phase compensation method.
  • the base station 400 performs scheduling of the terminal 300 (for example, frequency resource allocation and MCS selection) using the data SINR measurement value derived by the data SINR deriving unit 209.
  • phase compensation method setting processing in the phase compensation control unit 109 (FIG. 11) of the terminal 300 and the phase compensation setting unit 403 (FIG. 12) of the base station 400 will be described.
  • the elapsed time (transmission time interval) T from the transmission time t1 of the previously transmitted uplink signal (P-SRS signal) to the transmission time t2 of the uplink signal (PUSCH) transmitted this time. Is 20 ms or less, the RPC error is small, and the elapsed time T is longer than 20 ms, the RPC error is large.
  • the elapsed time (transmission time interval) T from time t1 to time t2 is within 20 ms (T ⁇ 20 ms).
  • two antenna ports (Ports 20, 21) are set for P-SRS transmission.
  • PDCCH including control information regarding PUSCH signal allocation is transmitted in Format 4 (DCI format 4). That is, in FIG. 13, two antenna ports (Ports 20, 21) are set for transmission of the PUSCH signal at time t2.
  • Format 0 DCI format 0
  • one antenna port (Port 10) is set for transmission of the PUSCH signal at time t2. It shall be (not shown).
  • the phase compensation determination unit 304 first determines the transmission time interval T calculated by the calculation unit 303 based on the PDCCH format type (number of antenna ports) as shown in FIG.
  • the allowable RPC error ⁇ phase is determined according to the table shown.
  • the phase compensation determination unit 304 adds an additional tolerance for the set allowable RPC error with reference to FIG. 14, for example.
  • RPC error additional allowable RPC error
  • the phase compensation determining section 304 as in the first embodiment, from the determined allowable RPC error delta phase, to determine the phase compensation method.
  • the phase compensation determining section 304 the ratio ⁇ P of transmission power 'when is large, the ratio ⁇ P of transmission power' in comparison with the case is small, to increase the permissible RPC error delta phase To determine the phase compensation method.
  • terminal 300 allows a large RPC error as a phase compensation method for PUSCH that can be regarded as having a large RPC error due to the amount of change in transmission power.
  • terminal 300 uses the format of data allocation information used for PUSCH signal allocation (size relationship of the number of antenna ports), and P -Set the PUSCH phase compensation method according to the ratio of the transmission power between the SRS and the PUSCH signal. Thereby, terminal 300 can reduce the influence of the RPC error that occurs depending on the transmission power change amount.
  • the terminal even when a different number of antenna ports is set for transmission of each uplink signal, the terminal considers the amount of change in transmission power in addition to Embodiment 1, and allows the allowable RPC for the transmission signal. Set the error. Accordingly, the terminal can control signal transmission that is expected to have a large allowable RPC error at a minimum device cost necessary to obtain a desired RPC error. Therefore, it is possible to suppress the increase in the device cost of the terminal while preventing the deterioration of the SINR measurement accuracy due to the RPC error in the base station. Therefore, according to the present embodiment, it is possible to avoid an increase in device cost due to required RPC accuracy even when different numbers of antenna ports are set for transmission of each uplink signal.
  • the transmission power ratio and the additional allowable RPC error shown in FIG. 14 when the correspondence between the transmission power ratio and the additional allowable RPC error shown in FIG. 14 is defined in advance by the system, signaling for each transmission for uplink signal transmission power control is unnecessary. It becomes.
  • the association between the transmission power ratio and the additional allowable RPC error shown in FIG. 14 is notified in advance from the base station to the terminal as a parameter, the parameter is notified to the terminal only for a relatively long period or once. It suffices to perform signaling for each transmission for uplink signal transmission power control. Therefore, in these cases, an increase in signaling overhead required for uplink signal transmission power control can be suppressed.
  • the uplink signal transmitted at time t2 is not limited to PUSCH, and for example, SRS (P-SRS or A-SRS) may be transmitted at time t2. That is, terminal 300 is based on a comparison between the number of antenna ports used last time for transmission of an uplink signal (PUSCH, PUCCH, or SRS) different from time t2 and the number of antenna ports used for SRS transmitted at time t2.
  • the phase of the SRS may be controlled. Further, for example, it is assumed that the SRS transmission request is notified from the base station 400 by the PDCCH.
  • terminal 300 when terminal 300 receives PDCCH including data allocation information for one antenna port (when one antenna port is used at time t2), terminal 300 sets a large allowable RPC error, and a plurality of antennas When a PDCCH including data allocation information for a port is received (when a plurality of antenna ports are used at time t2), a small allowable RPC error is set.
  • the frequency position and bandwidth of the transmission signal change greatly as ⁇ P increases (the increase or decrease in transmission power increases). That is, since the amplification characteristic of PA also depends on the frequency (frequency position and bandwidth), the larger the ⁇ P (the greater the increase / decrease in frequency position and bandwidth), the greater the RPC error. That is, the amount of change in the frequency bandwidth (transmission bandwidth) of the transmission signal can be regarded as the amount of change in transmission power.
  • the terminal in addition to the processing in Embodiment 1, the terminal further transmits a signal to be transmitted this time based on the transmission bandwidth of the signal transmitted last time and the transmission bandwidth of the signal transmitted this time.
  • An allowable RPC error with respect to is specified, and phase compensation is performed.
  • FIG. 15 shows the configuration of terminal 500 according to the present embodiment.
  • the same components as those in the first embodiment (FIG. 7) and the second embodiment (FIG. 11) are denoted by the same reference numerals, and the description thereof is omitted.
  • allocation band information acquisition section 501 includes transmission bandwidth B SRS of a P-SRS signal (previously transmitted signal) and transmission bandwidth B PUSCH of PUSCH (signal transmitted this time) .
  • the phase compensation determination unit 502 of the phase compensation control unit 109 transmits a transmission time interval between the uplink signal (PUSCH signal) transmitted immediately before (previous transmission) by the terminal 500 and the uplink signal (A-SRS) transmitted this time.
  • the phase compensation method is determined according to the size relationship of the number of antenna ports and the ratio of the transmission bandwidth.
  • the elapsed time (transmission time interval) T from the transmission time t1 of the previously transmitted uplink signal (P-SRS signal) to the transmission time t2 of the uplink signal (PUSCH) transmitted this time. Is 20 ms or less, the RPC error is small, and the elapsed time T is longer than 20 ms, the RPC error is large.
  • the elapsed time (transmission time interval) T from time t1 to time t2 is within 20 ms (T ⁇ 20 ms).
  • two antenna ports (Ports 20, 21) are set for P-SRS transmission.
  • PDCCH including control information related to PUSCH signal allocation is transmitted in Format 4 (DCI format 4). That is, in FIG. 16, two antenna ports (Ports 20, 21) are set for transmission of the PUSCH signal at time t2.
  • Format 0 DCI format 0
  • one antenna port (Port 10) is set for transmission of the PUSCH signal at time t2. It shall be (not shown).
  • the phase compensation determination unit 502 first determines the transmission time interval T calculated by the calculation unit 303 based on the PDCCH format type (the size relationship of the number of antenna ports) and the table shown in FIG. 10, for example, as in the first embodiment. according, to determine the permissible RPC error delta phase.
  • the phase compensation determination unit 502 adds an additional tolerance for the set allowable RPC error with reference to FIG. 17, for example.
  • RPC error additional allowable RPC error
  • the phase compensation determining unit 502 adds the additional allowable RPC error ( ⁇ 10 deg) to the allowable RPC error ⁇ phase ( ⁇ ), and adds the added allowable RPC error ⁇ phase (that is, ( ⁇ ⁇ 10) deg). decide.
  • the phase compensation determination unit 502 determines a phase compensation method from the determined allowable RPC error.
  • the phase compensation determining section 502 when the ratio ⁇ B transmission bandwidth is large, as compared with when the ratio ⁇ B transmission bandwidth is small, to increase the permissible RPC error delta phase To determine the phase compensation method.
  • terminal 500 allows a large RPC error as a phase compensation method for PUSCH that can be regarded as having a large RPC error due to a transmission power change amount.
  • terminal 500 adds P-SRS in addition to the transmission conditions in Embodiment 2 (transmission time interval T, format of data allocation information used for PUSCH signal allocation (size relationship of the number of antenna ports)).
  • the PUSCH phase compensation method is set according to the ratio of the transmission bandwidth between the signal and the PUSCH signal. Thereby, terminal 500 can reduce the influence of the RPC error that occurs depending on the transmission power change amount.
  • the terminal even when a different number of antenna ports is set for transmission of each uplink signal, the terminal takes into account the amount of change in transmission power in addition to Embodiment 1 and Embodiment 2.
  • An allowable RPC error for the transmission signal is set. Accordingly, the terminal can control signal transmission that is expected to have a large allowable RPC error at a minimum device cost necessary to obtain a desired RPC error. Therefore, it is possible to suppress the increase in the device cost of the terminal while preventing the deterioration of the SINR measurement accuracy due to the RPC error in the base station. Therefore, according to the present embodiment, it is possible to avoid an increase in device cost due to required RPC accuracy even when different numbers of antenna ports are set for transmission of each uplink signal.
  • the terminal and the base station is ⁇ acceptable RPC error delta phase, described in the construction carrying two beta (see Figure 10).
  • the terminal and the base station are configured to have only a small allowable RPC error ( ⁇ ) and have no phase compensation operation corresponding to the large allowable RPC error ( ⁇ ). Also good. Thereby, in this Embodiment, it becomes possible to further suppress the increase in the apparatus cost of the terminal 100.
  • FIG. 10 illustrates that the terminal and the base station is ⁇ acceptable RPC error delta phase, described in the construction carrying two beta (see Figure 10).
  • the terminal and the base station are configured to have only a small allowable RPC error ( ⁇ ) and have no phase compensation operation corresponding to the large allowable RPC error ( ⁇ ). Also good.
  • the terminal uses a maximum of two antenna ports.
  • the number of antenna ports used by the terminal is not limited to this, and for example, a maximum of four antenna ports may be used.
  • the antenna port in the above embodiment refers to a logical antenna composed of one or a plurality of physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas.
  • LTE Long Term Evolution
  • Reference signals For example, in LTE, it is not defined how many physical antennas an antenna port is composed of, but is defined as a minimum unit in which a base station can transmit different reference signals (Reference signals).
  • the antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).
  • each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
  • the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • the present invention can be applied to a mobile communication system or the like.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif de transmission qui est capable d'éviter une augmentation des coûts du dispositif causée par une précision RPC requise, même dans le cas où un nombre différent de ports d'antennes est établi pour la transmission de chaque signal en amont. Dans ce dispositif, un contrôleur de compensation de phase (109) commande la phase d'un signal, et des unités de transmission RF (108-1, 108-2) transmettent le signal à phase commandée par le biais d'au moins un port d'antenne. Le contrôleur de compensation de phase (109) commande la phase sur la base d'une comparaison entre au moins un nombre de ports d'antenne et le nombre de ports d'antenne utilisé lors de la transmission précédente.
PCT/JP2012/000619 2011-02-14 2012-01-31 Dispositif de transmission et procédé de transmission WO2012111266A1 (fr)

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