WO2020250301A1 - Dispositif de transmission, dispositif de réception, système de communication sans fil, procédé de réglage d'antenne de transmission, et procédé de réglage d'antenne de réception - Google Patents

Dispositif de transmission, dispositif de réception, système de communication sans fil, procédé de réglage d'antenne de transmission, et procédé de réglage d'antenne de réception Download PDF

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Publication number
WO2020250301A1
WO2020250301A1 PCT/JP2019/023087 JP2019023087W WO2020250301A1 WO 2020250301 A1 WO2020250301 A1 WO 2020250301A1 JP 2019023087 W JP2019023087 W JP 2019023087W WO 2020250301 A1 WO2020250301 A1 WO 2020250301A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antennas
base station
terminal
distance
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PCT/JP2019/023087
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English (en)
Japanese (ja)
Inventor
裕貴 井浦
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/023087 priority Critical patent/WO2020250301A1/fr
Publication of WO2020250301A1 publication Critical patent/WO2020250301A1/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
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station

Definitions

  • the present invention relates to a transmitting device including a plurality of antennas, a receiving device, a wireless communication system, a transmitting antenna adjusting method, and a receiving antenna adjusting method.
  • MIMO Multiple Input Multiple Output
  • a transmitting device and a receiving device use a plurality of antennas
  • a method for realizing high-speed transmission As a feature of transmission by MIMO, by multiplexing a plurality of transmission data in space, the communication speed can be increased by the amount of the multiple transmission data without expanding the band of the frequency to be used.
  • the performance of MIMO transmission differs depending on the characteristics of the channel matrix consisting of the transmission coefficients between the plurality of antennas included in the transmitting device and the plurality of antennas provided in the receiving device.
  • the eigenvalues of the channel matrix are the same power, the reception quality of the plurality of multiplex transmission data is the same, and the maximum transmission efficiency of MIMO transmission in Shannon theory is obtained.
  • a specific eigenvalue is extremely large in the channel matrix, it becomes impossible to multiplex a plurality of transmission data in space, and the transmission efficiency is lowered. Such a technique is disclosed in Non-Patent Document 1.
  • Non-Patent Document 1 states that in a so-called line-of-sight environment in which the transmitter and receiver are not shielded, an ideal between the transmitter and the receiver is provided as a condition that the eigenvalues of the channel matrices have the same power. Positional relationship, that is, distance is shown. However, the ideal distance is limited. Therefore, there is a problem that the transmission efficiency is lowered when the distance between the transmitting device and the receiving device deviates from the ideal distance.
  • the present invention has been made in view of the above, and obtains a transmitting device capable of suppressing a decrease in transmission efficiency between a transmitting device and a receiving device when the line-of-sight environment is between the transmitting device and the receiving device. With the goal.
  • the present invention is a transmission device in a wireless communication system including a transmission device capable of transmitting a plurality of signals and a reception device capable of receiving a plurality of signals.
  • the transmitting device uses information acquired in communication with the receiving device to estimate the distance between the transmitting device and the receiving device, and a plurality of antennas based on the distance estimated by the distance estimating unit.
  • An antenna control unit that generates control information for each antenna to control the transmission position of the signal from, and an adjacent antenna that controls the transmission position of the signal to be transmitted to the receiving device based on the control information for each antenna. It is characterized by including a plurality of antennas for adjusting the interval between transmission positions.
  • the transmitting device has an effect that a decrease in transmission efficiency between the transmitting device and the receiving device can be suppressed when there is a line-of-sight environment between the transmitting device and the receiving device.
  • Block diagram showing a configuration example of a base station according to the first embodiment The figure which shows the configuration example of the antenna of the base station which concerns on Embodiment 1.
  • Block diagram showing a configuration example of a terminal according to the first embodiment The figure which shows the configuration example of the antenna of the terminal which concerns on Embodiment 1.
  • the figure which shows the example of the case where the processing circuit provided in the base station which concerns on Embodiment 1 is configured by a processor and a memory
  • the figure which shows the example of the case where the processing circuit provided in the base station which concerns on Embodiment 1 is configured by the dedicated hardware.
  • the figure which shows the example which the base station which concerns on Embodiment 2 adjusts the transmission position of an antenna.
  • the transmitting device, the receiving device, the wireless communication system, the transmitting antenna adjusting method, and the receiving antenna adjusting method according to the embodiment of the present invention will be described in detail with reference to the drawings.
  • the present invention is not limited to this embodiment.
  • Embodiment 1 a wireless communication system including a base station capable of transmitting a plurality of signals and a terminal capable of receiving a plurality of signals, that is, a wireless communication system in which the base station and the terminal perform wireless communication by MIMO transmission is specified. The case where a signal is transmitted from the base station to the terminal will be described.
  • FIG. 1 is a block diagram showing a configuration example of the base station 10 according to the first embodiment of the present invention.
  • the base station 10 is a transmission device that transmits a signal to a terminal (not shown).
  • the base station 10 includes signal generation units 11-1 to 11-M, modulation units 12-1 to 12-M, a precoder 13, and OFDM (Orthogonal Frequency Division Multiplexing) modulation units 14-1 to 14-Ntx.
  • DA Digital to Analog conversion units 15-1 to 15-Ntx, frequency conversion units 16-1 to 16-Ntx, antennas 17-1 to 17-Ntx, distance estimation unit 18, and antenna control unit 19. , Equipped with.
  • M is an integer of 2 or more
  • Ntx is an integer of 2 or more.
  • the signal generation units 11-1 to 11-M generate a transmission data bit string from the user data by error correction.
  • the signal generation unit is described as "SIG".
  • the modulation units 12-1 to 12-M modulate the transmission data bit string generated by the signal generation units 11-1 to 11-M to generate transmission symbols s.
  • the transmission symbol s is represented by the equation (1).
  • the modulation unit is described as "MOD".
  • the precoder 13 performs a matrix operation on the transmission symbols s generated by the modulation units 12-1 to 12-M, and generates Ntx transmission symbols x.
  • the transmission symbol x is represented by the equation (2).
  • W represented by the equation (3)
  • the transmission symbol x after the matrix operation is expressed by the equation (4).
  • the precoder is described as "Precoder".
  • the OFDM modulation units 14-1 to 14-Ntx OFDM-modulate the transmission symbol x generated by the precoder 13 and convert the frequency domain signal into a time domain signal.
  • the OFDM modulation unit is described as "OFDMMOD”.
  • the DA conversion units 15-1 to 15-Ntx convert the transmission symbol x converted into a time domain signal by the OFDM modulation units 14-1 to 14-Ntx from a digital signal to an analog signal.
  • the DA conversion unit is described as "DA".
  • the frequency conversion units 16-1 to 16-Ntx convert the frequency of the transmission symbol converted into an analog signal by the DA conversion units 15-1 to 15-Ntx into the carrier frequency of the wireless communication system.
  • the frequency conversion unit is described as "TX”.
  • Antennas 17-1 to 17-Ntx transmit a transmission symbol converted to a carrier frequency by the frequency conversion unit 16-1 to 16-Ntx, that is, a signal to a terminal.
  • the antennas 17-1 to 17-Ntx radiate radio waves based on the signal transmitted to the terminal into space.
  • the antennas 17-1 to 17-Ntx control the transmission position of the signal to be transmitted to the terminal based on the control information for each of the antennas 17-1 to 17-Ntx generated by the antenna control unit 19 described later. , Adjust the transmission position spacing between adjacent antennas.
  • the signal transmitted by the antennas 17-1 to 17-Ntx may be referred to as a transmission signal.
  • antennas 17-1 to 17-Ntx are not distinguished, they may be referred to as antenna 17.
  • the distance estimation unit 18 estimates the distance between the base station 10 and the terminal which is the receiving device by using the information acquired by the communication with the terminal. The method of estimating the distance between the base station 10 and the terminal in the distance estimation unit 18 will be described later.
  • the antenna control unit 19 is an antenna for controlling the transmission position of signals from the plurality of antennas 17-1 to 17-Ntx based on the distance between the base station 10 and the terminal estimated by the distance estimation unit 18.
  • the control information for each 17 is generated.
  • the distance between the antennas 17-1 to 17-Ntx provided in the base station 10 and the distance between the antennas 17-1 to 17-Ntx provided in the terminal will be described later.
  • the values of the plurality of eigenvalues of the channel matrix can be equal to each other.
  • the antenna control unit 19 controls the operation of the antennas 17-1 to 17-Ntx according to the control information, and changes the transmission position of the transmission signal from the antennas 17-1 to 17-Ntx.
  • FIG. 2 is a diagram showing a configuration example of the antenna 17 of the base station 10 according to the first embodiment.
  • the antenna 17 includes an antenna element 170 and a drive unit 171.
  • the antenna element 170 transmits a transmission signal toward the terminal.
  • the drive unit 171 can move the position of the antenna element 170 based on the control information generated by the antenna control unit 19. That is, the drive unit 171 adjusts the transmission position of the antenna 17, which is the position of the antenna element 170, based on the control information generated by the antenna control unit 19.
  • FIG. 3 is a diagram showing an image of adjustment of the transmission position of the antennas 17-1 to 17-Ntx performed by the base station 10 according to the first embodiment.
  • FIG. 3A shows the state before adjusting the transmission position of the antennas 17-1 to 17-Ntx
  • FIG. 3B shows the state after adjusting the transmission position of the antennas 17-1 to 17-Ntx. Indicates the state.
  • the base station 10 can adjust the distance d between the antennas 17-1 to 17-Ntx based on the distance between the base station 10 and the terminal to obtain the distance d + ⁇ L.
  • the antenna control unit 19 is described in Non-Patent Document 1 when the center of the antenna array by the antennas 17-1 to 17-Ntx included in the base station 10 and the center of the antenna array by the plurality of antennas included in the terminal face each other. Assuming an evenly spaced linear array using the above equations, control information for each antenna 17 can be generated based on the equation represented by the equation (5).
  • d t is the element spacing of antennas 17-1 ⁇ 17-Ntx the base station 10 is provided
  • d r is the element spacing of a plurality of antennas provided in the terminal
  • V is the base station 10 and the antenna elements of the terminal
  • ⁇ is the wavelength
  • R is the distance between the base station 10 and the terminal.
  • the antennas 17-1 to 17-Ntx can control the operation of the drive unit 171 and adjust the transmission position of the antenna 17, which is the position of the antenna element 170, based on the control information.
  • FIG. 4 is a block diagram showing a configuration example of the terminal 20 according to the first embodiment.
  • the terminal 20 is a receiving device that receives a transmission signal from the base station 10.
  • the terminal 20 includes antennas 21-1 to 21-Nrx, frequency conversion units 22-1 to 22-Nrx, AD (Analog to Digital) conversion units 23-1 to 23-Nrx, and OFDM demodulation units 24-1-1. It includes 24-Nrx, a postcoder 25, demodulation units 26-1 to 26-M, decoding units 27-1 to 27-M, a distance estimation unit 28, and an antenna control unit 29.
  • Nrx is an integer of 2 or more.
  • Antennas 21-1 to 21-Nrx receive the signal transmitted from the base station 10. Specifically, the antennas 21-1 to 21-Nrx receive radio waves radiated into space. At this time, the antennas 21-1 to 21-Nrx are receiving positions for receiving the signal from the base station 10 based on the control information for each of the antennas 21-1 to 21-Nrx generated by the antenna control unit 29 described later. To adjust the distance between the receiving position and the adjacent antenna. When the antennas 21-1 to 21-Nrx are not distinguished, they may be referred to as an antenna 21. Here, the configuration of the antenna 21 will be described.
  • FIG. 5 is a diagram showing a configuration example of the antenna 21 of the terminal 20 according to the first embodiment.
  • the antenna 21 includes an antenna element 172 and a drive unit 173.
  • the antenna element 172 receives the signal from the base station 10 and outputs the received signal.
  • the drive unit 173 can move the position of the antenna element 172 based on the control information generated by the antenna control unit 29. That is, the drive unit 173 adjusts the reception position of the antenna 21, which is the position of the antenna element 172, based on the control information generated by the antenna control unit 29.
  • the frequency conversion units 22-1 to 22-Nrx convert the received signal of the carrier frequency, that is, the radio wave received by the antennas 21-1 to 21-Nrx, into a baseband signal.
  • the frequency conversion unit is described as "RX".
  • the AD conversion units 23-1 to 23-Nrx convert the baseband signal converted by the frequency conversion units 22-1 to 22-Nrx from an analog signal to a digital signal.
  • the AD conversion unit is described as "AD”.
  • the received signal y is represented by the equation (6).
  • the OFDM demodulation unit is described as "OFDMDEM".
  • the post coder 25 performs a matrix operation on the received signal y converted by the OFDM demodulation units 24-1 to 24-Nrx, and generates M symbols r.
  • the symbol r is represented by the equation (7).
  • the matrix used in the matrix operation is V represented by the equation (8)
  • the symbol r after the matrix operation is expressed by the equation (9).
  • the post coder is described as "Postcoder".
  • the demodulation units 26-1 to 26-M convert the symbol r generated by the post coder 25 into a bit string.
  • the demodulation unit is described as "DEM”.
  • the decoding units 27-1 to 27-M decode the bit strings converted by the demodulation units 26-1 to 26-M by error correction.
  • the decoding unit is described as "DEC".
  • the distance estimation unit 28 estimates the distance between the base station 10 and the terminal 20 by using the information acquired in the communication with the base station 10. The method of estimating the distance between the base station 10 and the terminal 20 in the distance estimation unit 28 will be described later.
  • the antenna control unit 29 is an antenna for controlling the signal reception positions of the plurality of antennas 21-1 to 21-Nrx based on the distance between the base station 10 and the terminal 20 estimated by the distance estimation unit 28. 21 Control information is generated for each. As described above, when the line-of-sight environment is between the base station 10 and the terminal 20, the distance between the antennas 17-1 to 17-Ntx provided by the base station 10 and the antennas 21-1 to 21-Nrx provided by the terminal 20. By adjusting the interval and the ratio of the distance between the base station 10 and the terminal 20, the values of the plurality of eigenvalues of the channel matrix can be equal to each other.
  • the antenna control unit 29 controls the operation of the antennas 21-1 to 21-Nrx according to the control information, and changes the reception position of the reception signal of the antennas 21-1 to 21-Nrx.
  • the adjustment of the receiving position of the antennas 21-1 to 21-Nrx by the terminal 20 is not shown, but is the same as the case of the antennas 17-1 to 17-Ntx of the base station 10 which is the transmitting device shown in FIG. Is.
  • the antennas 21-1 to 21-Nrx can control the operation of the drive unit 173 based on the control information and adjust the reception position of the antenna 21 which is the position of the antenna element 172.
  • the matrix H is represented by the equation (10).
  • the operation of estimating the distance between the base station 10 and the terminal 20 will be described in the distance estimation unit 18 of the base station 10 and the distance estimation unit 28 of the terminal 20.
  • the main body of the base station 10 is the distance estimation unit 18, and the main body of the terminal 20 is the distance estimation unit 28.
  • the base station 10 and the terminal 20 will be mainly described. To do.
  • FIG. 6 is a diagram showing a first example of an operation in which the base station 10 estimates the distance between the base station 10 and the terminal 20 in the wireless communication system 30 according to the first embodiment.
  • the base station 10 transmits a reference signal to the terminal 20, and the terminal 20 determines the distance between the base station 10 and the terminal 20 or the distance between the base station 10 and the terminal 20 according to the analysis result of the reference signal.
  • the method of sending back the information corresponding to the distance to the base station 10 as the position-related information is shown. Specifically, there are methods such as the following estimation method # 1 to estimation method # 3.
  • the base station 10 transmits a reference signal to the terminal 20.
  • the terminal 20 receives the reference signal transmitted from the base station 10, measures the received power of the reference signal, and notifies the base station 10 of the received power information as position-related information. Since the base station 10 knows the transmission power of the reference signal, the distance between the base station 10 and the terminal 20 is estimated from the amount of attenuation of the received power with respect to the transmission power by knowing the reception power at the terminal 20. can do.
  • the base station 10 may notify the terminal 20 of the information on the transmission power of the reference signal in advance. In this case, the terminal 20 can estimate the distance between the base station 10 and the terminal 20 by comparing the notified transmission power with the received power of the measured reference signal.
  • the terminal 20 notifies the base station 10 of the information on the estimated distance between the base station 10 and the terminal 20 as position-related information.
  • Estimating method # 2 The base station 10 transmits a reference signal to the terminal 20. After receiving the reference signal, the terminal 20 transmits a response signal to the base station 10 within a specified time.
  • the base station 10 can measure the signal propagation delay time between the base station 10 and the terminal 20 and between the terminal 20 and the base station 10 from the transmission time of the reference signal and the reception time of the response signal.
  • the base station 10 can estimate the distance between the base station 10 and the terminal 20 from the measured signal propagation delay time.
  • Estimating method # 3 When the base station 10 or the terminal 20 moves at a constant speed in a moving body and the moving direction axis and the axis connecting the base station 10 and the terminal 20 are at a constant angle, the terminal 20 is referred to as a reference signal. By measuring the Doppler frequency of, the distance between the base station 10 and the terminal 20 can be estimated. The terminal 20 notifies the base station 10 of the information on the estimated distance between the base station 10 and the terminal 20 as position-related information.
  • both the base station 10 and the terminal 20 can estimate the distance between the base station 10 and the terminal 20.
  • the base station 10 estimates the distance
  • the base station 10 notifies the terminal 20 of the distance information
  • the terminal 20 does not have to estimate the distance
  • the terminal 20 notifies the base station 10 of the distance information
  • the base station 10 does not have to estimate the distance.
  • each of the base station 10 and the terminal 20 may perform the same operation, and each of the base station 10 and the terminal 20 may estimate the distance.
  • the position-related information notified from the terminal 20 to the base station 10 does not need to be notified on the wireless communication system 30, and may be notified via another communication system.
  • FIG. 7 is a diagram showing a second example of an operation in which the base station 10 estimates the distance between the base station 10 and the terminal 20 in the wireless communication system 30 according to the first embodiment.
  • the base station 10 analyzes the reference signal from the terminal 20 to obtain the base station 10 without the position-related information from the terminal 20. It is also possible to estimate the distance to the terminal 20.
  • FIG. 8 is a diagram showing a third example of an operation in which the base station 10 estimates the distance between the base station 10 and the terminal 20 in the wireless communication system 30 according to the first embodiment.
  • FIG. 8 shows a method of notifying the base station 10 of the position-related information measured by the terminal 20. Specifically, there are methods such as the following estimation method # 4 to estimation method # 6.
  • Estimating method # 4 The base station 10 and the terminal 20 are equipped with a GPS (Global Positioning System) receiver (not shown).
  • the terminal 20 notifies the base station 10 of the GPS position information of the terminal 20 measured by the GPS receiver as position-related information.
  • the base station 10 uses the GPS position information of the base station 10 measured by the GPS receiver of the base station 10 and the acquired GPS position information of the terminal 20 to determine the distance between the base station 10 and the terminal 20. Can be estimated.
  • Estimating method # 5 A sensor capable of detecting the terminal 20 is installed in the moving area of the terminal 20, and the information detected by the sensor is notified from the sensor or the terminal 20 to the base station 10 as position-related information. May be good.
  • the base station 10 estimates the distance between the base station 10 and the terminal 20 from the information detected by the sensor. can do.
  • the terminal 20 is equipped with a camera (not shown).
  • the terminal 20 may estimate the position of the terminal 20 from the image captured by the camera and notify the base station 10 of the estimated position of the terminal 20 as position-related information.
  • the position-related information notified from the terminal 20 to the base station 10 does not need to be notified on the wireless communication system 30, and may be notified via another communication system.
  • FIG. 9 is a diagram showing a control flow for adjusting the transmission positions of the antennas 17-1 to 17-Ntx in the base station 10 according to the first embodiment.
  • the distance estimation unit 18 estimates the distance between the base station 10 and the terminal 20 from the position-related information. The operation of estimating the distance between the base station 10 and the terminal 20 in the distance estimation unit 18 differs depending on the type of position-related information. For example, when GPS position information is input as position-related information, the distance estimation unit 18 uses the GPS position information of the base station 10 and the GPS position information of the terminal 20 to determine the distance between the base station 10 and the terminal 20. To calculate. The distance estimation unit 18 outputs the calculated distance information to the antenna control unit 19.
  • the antenna control unit 19 generates control information for the antennas 17-1 to 17-Ntx based on the acquired distance information between the base station 10 and the terminal 20, and outputs the control information to the antennas 17-1 to 17-Ntx. To do.
  • the drive unit 171 controls the position of the antenna element 170 based on the control information.
  • the base station 10 can adjust the distance between the antennas 17-1 to 17-Ntx, that is, the transmission position, based on the distance between the base station 10 and the terminal 20.
  • the operation of the terminal 20 is the same as the operation of the base station 10.
  • the distance estimation unit 28 and the antenna control unit 29 perform the same control as the distance estimation unit 18 and the antenna control unit 19 of the base station 10, based on the distance between the base station 10 and the terminal 20.
  • the distance between the antennas 21-1 to 21-Nrx, that is, the receiving position can be adjusted.
  • FIG. 10 is a flowchart showing the operation of the base station 10 according to the first embodiment.
  • the distance estimation unit 18 estimates the distance between the base station 10 and the terminal 20 by using the position-related information or the reference signal acquired from the terminal 20 (step S11).
  • the antenna control unit 19 controls the transmission position of the signal from the antennas 17-1 to 17-Ntx based on the distance between the base station 10 and the terminal 20 estimated by the distance estimation unit 18. Control information for each is generated (step S12).
  • the antennas 17-1 to 17-Ntx control the transmission position of the signal transmitted to the terminal 20 based on the control information for each antenna 17 generated by the antenna control unit 19, and transmit the signal to and from the adjacent antenna 17.
  • the position interval is adjusted (step S13).
  • FIG. 11 is a flowchart showing the operation of the terminal 20 according to the first embodiment.
  • the terminal 20 may acquire the distance between the base station 10 and the terminal 20 from the base station 10 without estimating it by the terminal 20.
  • the distance estimation unit 28 acquires the distance between the base station 10 and the terminal 20 from the base station 10 (step S21).
  • the antenna control unit 29 controls each antenna 21 for controlling the reception position of the signals of the antennas 21-1 to 21-Nrx based on the distance between the base station 10 and the terminal 20 acquired by the distance estimation unit 28. Control information is generated (step S22).
  • the antennas 21-1 to 21-Nrx control the reception position of the signal received from the terminal 20 based on the control information for each antenna 21 generated by the antenna control unit 29, and receive between the antennas 21 and the adjacent antennas 21.
  • the position interval is adjusted (step S23).
  • the operation when the distance estimation unit 28 estimates the distance between the base station 10 and the terminal 20 is the same as the operation of the flowchart of the base station 10 shown in FIG.
  • the base station 10 adjusts the distance between the transmission positions of the antennas 17-1 to 17-Ntx, and the terminal 20 adjusts the distance between the transmission positions of the antennas 21-1 to 21-Nrx. As explained, but not limited to this. In the wireless communication system 30, only the base station 10 may adjust the interval between the transmission positions of the antennas 17-1 to 17-Ntx, and only the terminal 20 may adjust the interval between the transmission positions of the antennas 21-1 to 21-Nrx. You may adjust. Also in this case, in the wireless communication system 30, the base station 10 adjusts the distance between the transmission positions of the antennas 17-1 to 17-Ntx, and the terminal 20 adjusts the distance between the transmission positions of the antennas 21-1 to 21-Nrx. Although the effect is small as compared with the case of the above, it is possible to suppress a decrease in transmission efficiency between the base station 10 and the terminal 20.
  • the configurations other than the drive unit 171 of the antennas 17-1 to 17-Ntx, the distance estimation unit 18, and the antenna control unit 19 are general transmission devices that perform MIMO transmission.
  • the drive unit 171 of the antennas 17-1 to 17-Ntx is a drive device equipped with a motor or the like.
  • the distance estimation unit 18 and the antenna control unit 19 are realized by a processing circuit.
  • the processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware.
  • FIG. 12 is a diagram showing an example in which the processing circuit included in the base station 10 according to the first embodiment is configured by a processor and a memory.
  • the processing circuit is composed of the processor 91 and the memory 92, each function of the processing circuit of the base station 10 is realized by software, firmware, or a combination of software and firmware.
  • the software or firmware is written as a program and stored in the memory 92.
  • each function is realized by the processor 91 reading and executing the program stored in the memory 92. That is, the processing circuit includes a memory 92 for storing a program in which the processing of the base station 10 is eventually executed. It can also be said that these programs cause a computer to execute the procedures and methods of the base station 10.
  • the processor 91 may be a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.
  • the memory 92 includes, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (registered trademark) (Electrically EPROM).
  • RAM Random Access Memory
  • ROM Read Only Memory
  • flash memory e.g., EPROM (Erasable Programmable ROM), and EEPROM (registered trademark) (Electrically EPROM).
  • Semiconductor memory magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), etc. are applicable.
  • FIG. 13 is a diagram showing an example in which the processing circuit included in the base station 10 according to the first embodiment is configured by dedicated hardware.
  • the processing circuit 93 shown in FIG. 13 includes, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), and the like. FPGA (Field Programmable Gate Array) or a combination of these is applicable.
  • Each function of the base station 10 may be realized by the processing circuit 93 for each function, or each function may be collectively realized by the processing circuit 93.
  • the functions of the base station 10 may be realized by dedicated hardware, and some may be realized by software or firmware.
  • the processing circuit can realize each of the above-mentioned functions by the dedicated hardware, software, firmware, or a combination thereof.
  • the hardware configuration of the base station 10 has been described, the hardware configuration of the terminal 20 is also the same.
  • the configurations other than the drive unit 173, the distance estimation unit 28, and the antenna control unit 29 of the antennas 21-1 to 21-Nrx are general receiving devices that perform MIMO transmission.
  • the drive unit 173 of the antennas 21-1 to 21-Nrx is a drive device equipped with a motor or the like.
  • the distance estimation unit 28 and the antenna control unit 29 are realized by a processing circuit.
  • the processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware.
  • the wireless communication system 30 at least one of the base station 10 and the terminal 20 estimates the distance between the base station 10 and the terminal 20, and the base station 10 and the terminal 20 in the present embodiment. It was decided that at least one of the 20 would transmit and receive signals by adjusting the antenna spacing. As a result, the wireless communication system 30 can realize highly efficient wireless transmission by spatially multiplexing a plurality of signals at the same frequency at the same time.
  • the wireless communication system 30 has a transmission efficiency between the base station 10 and the terminal 20 regardless of the distance between the base station 10 and the terminal 20 when the line-of-sight environment is between the base station 10 and the terminal 20. Can be suppressed.
  • the terminal 20 has a configuration as shown in FIG. 1
  • the base station 10 has a configuration as shown in FIG.
  • the antennas 17-1 to 17-Ntx of the base station 10 and the antennas 21-1 to 21-Nrx of the terminal 20 each include one antenna element.
  • the antennas 17-1 to 17-Ntx of the base station 10 and the antennas 21-1 to 21-Nrx of the terminal 20 include a plurality of antenna elements will be described.
  • digital chains such as DA conversion units 15-1 to 15-Ntx and frequency conversion units 16-1 to 16-Ntx are connected to a single antenna element 170 of the base station 10, and the terminal 20 is simply connected. It was assumed that digital chains such as frequency conversion units 22-1 to 22-Nrx and AD conversion units 23-1 to 23-Nrx would be connected to one antenna element 172.
  • one digital chain in wireless communication using a carrier frequency of several tens of GHz class, one digital chain is connected to a sub-array by APAA (Active Phased Array Antenna) that forms an analog beam by analog-synthesizing a plurality of antenna elements. It is assumed that it will be done.
  • the base station 10 and the terminal 20 perform MIMO transmission using a plurality of subarrays.
  • the configuration of the base station 10 is the same as the configuration of the base station 10 in the first embodiment shown in FIG. 1, but the configuration of the antennas 17-1 to 17-Ntx is the configuration of the first embodiment. It is different from the configuration at the time of.
  • FIG. 14 is a diagram showing a configuration example of the antenna 17 of the base station 10 according to the second embodiment.
  • the antenna 17 includes a sub-array 177.
  • the sub-array 177 includes variable phase shifters 174-1 to 174-n, variable amplifiers 175-1 to 175-n, and antenna elements 176-1 to 176-n. Note that n is an integer of 2 or more.
  • variable phase shifters 174-1 to 174-n adjust the phase of the transmission signal based on the control information generated by the antenna control unit 19.
  • variable phase shifters 174 When the variable phase shifters 174-1 to 174-n are not distinguished, they may be referred to as variable phase shifters 174.
  • the variable amplifiers 175-1 to 175-n amplify the transmission signal based on the control information generated by the antenna control unit 19.
  • variable amplifiers 175-1 to 175-n are not distinguished, they may be referred to as variable amplifiers 175.
  • the antenna elements 176-1 to 176-n transmit a signal toward the terminal 20. When the antenna elements 176-1 to 176-n are not distinguished, they may be referred to as antenna elements 176.
  • One variable phase shifter 174 and one variable amplifier 175 are connected to one antenna element 176. That is, the sub-array 177 includes a plurality of antenna elements 176, a variable amplifier 175 for each antenna element 176, and a variable phase shifter 174 for each antenna element 176.
  • the base station 10 forms a beam by synthesizing a plurality of signals transmitted from the antenna elements 176-1 to 176-n, that is, a plurality of radiated radio waves.
  • the base station 10 can control the shape of the formed beam by controlling the settings of the individual variable phase shifters 174 and the variable amplifier 175.
  • the antennas 17-1 to 17-Ntx control the operation of the plurality of variable amplifiers 175 and the plurality of variable phase shifters 174 based on the control information, and the beam formed by the plurality of antenna elements 176.
  • the transmission position of the antenna 17, which is the center position, is adjusted.
  • the base station 10 is a transmission device that performs MIMO transmission using a plurality of sub-arrays 177.
  • each antenna element 176 in the antennas 17-1 to 17-Ntx may be in the vertical direction, in the horizontal direction, or in a rectangular shape.
  • FIG. 15 is a diagram showing an example when the antenna element 176 is arranged in the vertical direction in the antenna 17 according to the second embodiment.
  • FIG. 16 is a diagram showing an example when the antenna element 176 is arranged in the lateral direction in the antenna 17 according to the second embodiment.
  • FIG. 17 is a diagram showing an example when the antenna element 176 is arranged in a rectangular shape in the antenna 17 according to the second embodiment. In FIGS. 15 to 17, only one circle is assigned the symbol “176” of the antenna element, but it is assumed that all the circles are the antenna element 176.
  • the configuration of the terminal 20 is the same as the configuration of the terminal 20 in the first embodiment shown in FIG. 4, but the configuration of the antennas 21-1 to 21-Nrx is different from the configuration in the first embodiment.
  • FIG. 18 is a diagram showing a configuration example of the antenna 21 of the terminal 20 according to the second embodiment.
  • the antenna 21 includes a sub array 181.
  • the sub-array 181 includes antenna elements 178-1 to 178-n, variable amplifiers 179-1 to 179-n, and variable phase shifters 180-1 to 180-n.
  • the antenna elements 178-1 to 178-n receive the signal from the base station 10. When the antenna elements 178-1 to 178-n are not distinguished, they may be referred to as antenna elements 178.
  • the variable amplifiers 179-1 to 179-n amplify the received signal based on the control information generated by the antenna control unit 29. When the variable amplifiers 179-1 to 179-n are not distinguished, they may be referred to as variable amplifiers 179.
  • the variable phase shifters 180-1 to 180-n adjust the phase of the received signal based on the control information generated by the antenna control unit 29. When the variable phase shifters 180-1 to 180-n are not distinguished, they may be referred to as variable phase shifters 180.
  • One variable amplifier 179 and one variable phase shifter 180 are connected to one antenna element 178.
  • the sub-array 181 includes a plurality of antenna elements 178, a variable amplifier 179 for each antenna element 178, and a variable phase shifter 180 for each antenna element 178.
  • the terminal 20 forms a beam by synthesizing a plurality of signals received by the antenna elements 178-1 to 178-n, that is, a plurality of radio waves.
  • the terminal 20 can control the shape of the formed beam by controlling the settings of the individual variable amplifier 179 and the variable phase shifter 180.
  • the antennas 21-1 to 21-Nrx control the operation of the plurality of variable amplifiers 179 and the plurality of variable phase shifters 180 based on the control information, and the beams formed by the plurality of antenna elements 178.
  • the reception position of the antenna 21, which is the central position is adjusted.
  • the terminal 20 is a receiving device that performs MIMO transmission using a plurality of sub-arrays 181.
  • the arrangement of the antenna elements 178 in the antennas 21-1 to 21-Nrx may be in the vertical direction or in the horizontal direction as in the arrangement of the antenna elements 176 in the antennas 17-1 to 17-Ntx described above. It may be directional or rectangular.
  • one sub-array 177 includes a plurality of antenna elements 176-1 to 176-n, a plurality of variable amplifiers 175-1 to 175-n, and a plurality of variable phase shifters 174-1 to 174-. It is composed of n.
  • the sub-array 177 can invalidate some of the antenna elements 176 by setting the power amplification factor of the variable amplifier 175 connected to some of the antenna elements 176 to be small and increasing the pass loss to the antenna element 176. it can.
  • FIG. 19 is a diagram showing an example in which the base station 10 according to the second embodiment adjusts the transmission position of the antennas 17-1 to 17-Ntx. It is assumed that the control information generated by the antenna control unit 19 in the base station 10 includes the number of the antenna element 176 to be invalidated for each sub-array 177.
  • the sub array 177 can change the phase center of each sub array 177, that is, the transmission position of the electrical antenna 17, by disabling the antenna element 176 having the number indicated by the control information. This is equivalent to changing the spacing of the sub-array 177, that is, the antenna 17.
  • FIG. 19 is a diagram showing an example in which the base station 10 according to the second embodiment adjusts the transmission position of the antennas 17-1 to 17-Ntx. It is assumed that the control information generated by the antenna control unit 19 in the base station 10 includes the number of the antenna element 176 to be invalidated for each sub-array 177.
  • the sub array 177 can change the phase center of each sub array 177, that is,
  • the base station 10 can adjust the interval of the sub-array 177.
  • the antenna element 176 is invalidated by adjusting the power amplification factor of the variable amplifier 175, but the method is not limited to this.
  • the sub-array 177 includes a switch (not shown) for each antenna element 176, and the antenna element 176 can be disabled by switching the switch on and off.
  • the antennas 17-1 to 17-Ntx may further include a drive unit 171.
  • the drive unit 171 controls the position of the sub array 177 based on the control information.
  • the base station 10 can adjust the distance between the antennas 17-1 to 17-Ntx, that is, the transmission position, based on the distance between the base station 10 and the terminal 20.
  • the operation of the terminal 20 is the same as the operation of the base station 10.
  • the distance estimation unit 28 and the antenna control unit 29 perform the same control as the distance estimation unit 18 and the antenna control unit 19 of the base station 10, based on the distance between the base station 10 and the terminal 20.
  • the distance between the antennas 21-1 to 21-Nrx, that is, the receiving position can be adjusted.
  • the hardware configurations of the base station 10 and the terminal 20 are the same as in the first embodiment.
  • the base station 10 and the terminal 20 are provided with a plurality of sub-arrays in the present embodiment. Even in this case, the wireless communication system 30 can obtain the same effect as that of the first embodiment.
  • the wireless communication system 30 may be composed of the base station 10 of the first embodiment and the terminal 20 of the second embodiment, or the base station 10 of the second embodiment and the terminal 20 of the first embodiment. It may be configured.
  • Embodiment 3 In the first and second embodiments, the case where the base station 10 as the transmitting device transmits a signal to the terminal 20 as the receiving device has been described, but it is also applied to a wireless communication system that transmits and receives signals in both directions. It is possible.
  • FIG. 20 is a diagram showing a configuration example of the wireless communication system 30a according to the third embodiment.
  • the wireless communication system 30a is a system in which the base station 10a and the terminal 20a can transmit and receive signals in both directions.
  • Each of the base station 10a and the terminal 20a includes a transmitting device 41 and a receiving device 42.
  • the transmission device 41 has the same configuration as the base station 10 described in the first embodiment or the second embodiment.
  • the receiving device 42 has the same configuration as the terminal 20 described in the first embodiment or the second embodiment.
  • the operation of the transmitting device 41 is the same as that of the base station 10 of the first or second embodiment, and the operation of the receiving device 42 is the same as that of the terminal 20 of the first or second embodiment. Is.
  • the base station 10a and the terminal 20a include a distance estimation unit 18, an antenna control unit 19, and antennas 17-1 to 17-Ntx included in the transmission device 41, and a distance estimation unit 28 and an antenna control unit included in the reception device 42. 29 and antennas 21-1 to 21-Nrx may be provided with only one of them.
  • the base station 10a and the terminal 20a communicate in both directions, that is, transmit and receive signals. Even in this case, the wireless communication system 30a can obtain the same effect as that of the first embodiment.
  • the configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

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

Abstract

L'invention concerne une station de base (10) dans un système de communication sans fil comprenant la station de base (10) capable de transmettre une pluralité de signaux et un terminal capable de recevoir une pluralité de signaux, la station de base (10) étant pourvue : d'une unité d'estimation de distance (18) qui estime une distance entre la station de base (10) et le terminal au moyen d'informations acquises en communication avec le terminal ; une unité de commande d'antenne (19) qui, sur la base de la distance estimée par l'unité d'estimation de distance (18), génère, pour chacune d'une pluralité d'antennes (17-1 à 17-Ntx), des informations de commande pour commander la position de transmission de signaux provenant de l'antenne ; et la pluralité d'antennes (17-1 à 17-Ntx) pour lesquels, sur la base des informations de commande pour les antennes respectives, les positions de transmission des signaux à transmettre au terminal sont commandées et les intervalles des positions de transmission entre les antennes adjacentes respectives sont ajustés.
PCT/JP2019/023087 2019-06-11 2019-06-11 Dispositif de transmission, dispositif de réception, système de communication sans fil, procédé de réglage d'antenne de transmission, et procédé de réglage d'antenne de réception WO2020250301A1 (fr)

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US11917601B2 (en) * 2021-10-08 2024-02-27 Qualcomm Incorporated Receiver for processing multiple beams at a user equipment (UE) device

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