公开(公告)号：EP3907908A1

公开(公告)日：2021-11-10

申请号：EP20756641.5

申请日：2020-01-31

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： SUGA Mizuki ,  ITO Kota ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04B10/2575 ,  H04B10/07 ,  H04W16/26 ,  H04W92/12

摘要： A derivation method includes: a transmission step of transmitting, to a wireless terminal, a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time and information on a second reception time; a transmission time period derivation step of deriving a first round trip time and deriving a second round trip time; and an optical fiber length derivation step of deriving an optical fiber length, based on the first round trip time, the second round trip time, a group velocity or a group delay time of the optical signal with the first wavelength, and a group velocity or a group delay time of the optical signal with the second wavelength.

公开(公告)号：EP4344078A1

公开(公告)日：2024-03-27

申请号：EP21940665.9

申请日：2021-05-17

申请人： Nippon Telegraph And Telephone Corporation

发明人： ITO Kota ,  SUGA Mizuki ,  ARAI Takuto ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04B7/06 ,  H04B10/2575

摘要： A wireless communication method in a wireless communication system including an exchange device and a base station device configured to perform beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device inputs an electrical signal based on the optically modulated signal to a beamforming circuit having an input port corresponding to the number of combinations of the optical wavelength, the frequency, and the optical polarization or the number of frequencies to perform beamforming in a direction corresponding to the input port to which the electrical signal has been input.

公开(公告)号：EP4383780A1

公开(公告)日：2024-06-12

申请号：EP21952797.5

申请日：2021-08-05

申请人： Nippon Telegraph And Telephone Corporation

发明人： ARAI Takuto ,  TOSHINAGA Hideki ,  KITA Naoki ,  SHIRATO Yushi ,  UCHIDA Daisei ,  SUGA Mizuki ,  ITO Kota

IPC分类号： H04W16/26 ,  H04W56/00 ,  H04B7/005 ,  H04B10/2575

CPC分类号： H04W16/26 ,  H04W56/00 ,  H04B10/2575 ,  H04B7/005

摘要： According to one aspect of the present invention, there is provided a radio communication device that performs communication with a terminal-side communication device having an antenna using an analog signal for transmitting information by a waveform of an amplitude or a phase of light to receive a signal received by the antenna and transmit a signal radiated by the antenna, the terminal-side communication device and the radio communication device being included in a radio communication system that performs radio communication with a communication target terminal via the antenna using time division duplex (TDD), the radio communication device including: an uplink delay adjustment unit configured to adjust a delay caused by propagation of an uplink signal that is a signal flowing from the terminal to the radio communication device via the antenna; and a downlink delay adjustment unit configured to adjust a delay caused by propagation of a downlink signal that is a signal flowing from the radio communication device to the terminal via the antenna.

公开(公告)号：EP3902159A1

公开(公告)日：2021-10-27

申请号：EP20755791.9

申请日：2020-01-31

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： SUGA Mizuki ,  ITO Kota ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04B10/2575 ,  H04B10/07 ,  H04W16/26 ,  H04W92/12

摘要： A derivation method is a derivation method performed by a communication system, including: a transmission step of transmitting a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time that is a reception time related to the first radio-wave signal, and information on a second reception time that is a reception time related to the second radio-wave signal; and an optical fiber length derivation step of deriving a length of the optical fiber, based on the first communication start time, the first reception time, the second communication start time, the second reception time, a group velocity or a group delay time of the optical signal with the first wavelength, and a group velocity or a group delay time of the optical signal with the second wavelength.

公开(公告)号：EP3893414A1

公开(公告)日：2021-10-13

申请号：EP20744618.8

申请日：2020-01-16

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： ITO Kota ,  SUGA Mizuki ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04J14/02 ,  H01Q3/30 ,  H01Q21/08 ,  H04B10/2575

摘要： To n antenna elements of the base station, n wavelengths set at predetermined intervals in a range in which chromatic dispersion in an optical fiber between accommodation and base stations can be regarded as constant are assigned. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval α 1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times. The accommodation station varies a reception phase shift interval α 2 for each piece of beacon number information to determine a reception phase shift interval α 2 which maximizes the received power and determines the transmission phase shift interval α 1 based on the beacon number information received from the terminal.

公开(公告)号：EP4362527A1

公开(公告)日：2024-05-01

申请号：EP21947078.8

申请日：2021-06-23

申请人： Nippon Telegraph And Telephone Corporation

发明人： ITO Kota ,  SUGA Mizuki ,  ARAI Takuto ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04W16/28 ,  H04W92/12 ,  H04B10/2513 ,  H04B10/2575

CPC分类号： H04W16/28 ,  H04B10/2513 ,  H04B10/2575 ,  H04W92/12

摘要： A wireless communication method in a wireless communication system including an accommodation station device and a base station device that performs beam formation according to control of the accommodation station device, includes: transmitting an optical modulation signal generated by performing intensity modulation on an optical signal on the basis of a transmission signal to be transmitted to the base station device via an optical transmission line by the accommodation station device controlling any combination of a light wavelength, a frequency, or an optical polarized wave, or a plurality of frequencies or a plurality of light wavelengths, to perform beamforming control of the base station device; transmitting the optical modulation signal after dispersion compensation is performed in an electrical domain or an optical domain in the accommodation station device or performing dispersion compensation on the optical modulation signal on the optical transmission line; and inputting, by the base station device, an electrical signal based on the dispersion-compensated optical modulation signal to a beamforming circuit having a plurality of input ports to perform beam formation in a direction corresponding to an input port to which the electrical signal is input.

公开(公告)号：EP4344079A1

公开(公告)日：2024-03-27

申请号：EP21940677.4

申请日：2021-05-17

申请人： Nippon Telegraph And Telephone Corporation

发明人： ITO Kota ,  SUGA Mizuki ,  ARAI Takuto ,  SHIRATO Yushi ,  KITA Naoki

IPC分类号： H04B7/06 ,  H04B10/2575

摘要： A wireless communication method in a wireless communication system including an exchange device and a base station device that performs beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device performs beamforming in a direction in which a wireless signal radiated from an antenna to which an electrical signal based on the optically modulated signal has been input is reflected by a reflector or is transmitted through a lens among antennas corresponding to the number of combinations of the optical wavelength, the frequency, and the optical polarization or the number of frequencies.