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1.发明授权公开(公告)号：US11303413B2
公开(公告)日：2022-04-12
申请号：US15681067
申请日：2017-08-18
申请人： NTT DOCOMO, INC.
摘要： A radio communication method for a user terminal performing communication in a cell where DL transmission and UL transmission vary in a time direction is provided. The radio communication method includes receiving downlink control information transmitted in a specific subframe; and analyzing a number and/or positions of subframes to be allocated for the DL transmission among subframes constituting a radio frame based on DL assignment in the downlink control information.
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公开(公告)号：US11212047B2
公开(公告)日：2021-12-28
申请号：US16295024
申请日：2019-03-07
申请人： NTT DOCOMO, INC.
发明人： Yoshihisa Kishiyama
IPC分类号： H04L5/00 , H04B17/336 , H04B1/10 , H04B1/7107 , H04B1/12 , H04J11/00 , H04W52/14
摘要： Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200A includes a target user control signal detector 230 and an interfering user control signal detector 240 which are configured to receive a control signal to be used to cancel a non-orthogonal signal by interference canceller. The control signal includes control information containing a radio resource block allocated to the non-orthogonal signal addressed to another mobile station. The mobile station 200A demodulates and cancels the radio signal addressed to the other mobile station on the basis of the control signal.
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公开(公告)号：US11171819B2
公开(公告)日：2021-11-09
申请号：US16466216
申请日：2017-12-14
申请人： NTT DOCOMO, INC.
摘要： A base station for transmitting a synchronization signal from N transmission antennas (N>=2) in orthogonal frequency division multiple access includes a signal sequence generation unit configured to generate a synchronization signal sequence to be used for the synchronization signal in a frequency domain; a subcarrier mapping unit configured to divide a transmission band of the synchronization signal into K frequency blocks (K>=2) and map the synchronization signal sequence into one or more subcarriers in the K frequency blocks; a precoding unit configured to generate N precoding vectors to be multiplied by the synchronization signal sequence in the frequency domain and multiply the synchronization signal sequence to be transmitted from an n-th antenna (1
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公开(公告)号：US10998952B2
公开(公告)日：2021-05-04
申请号：US16252883
申请日：2019-01-21
申请人： NTT DOCOMO, INC.
IPC分类号： H04B7/06 , H04L5/00 , H04W72/04 , H04W16/32 , H04B7/0413 , H04W16/28 , H04L27/26 , H04W84/04
摘要： A user apparatus is disclosed herein that includes a receiver configured to receive a plurality of synchronization signals and a transmitter configured to transmit a sounding reference signal associated with a specific synchronization signal of the plurality of synchronization signals. The transmitter also maps the sounding reference signal to consecutive OFDM symbols in one slot.
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公开(公告)号：US10924231B2
公开(公告)日：2021-02-16
申请号：US14516279
申请日：2014-10-16
申请人： NTT DOCOMO, INC.
摘要： To provide a radio base station apparatus and radio communication method capable of performing radio communications using downlink reference signal structures suitable for antenna virtualization, a radio base station apparatus (200) has a plurality of transmission antennas, generates CRSs used in demodulation of at least downlink control information, CQI-RSs generated for each of the transmission antennas used in measurement of channel quality, and DM-RSs generated for each stream used in demodulation of downlink transmission data, and multiplexes the CRSs, CQI-RSs and DM-RSs into a same transmission time unit to transmit from each of the antennas.
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公开(公告)号：US10721692B2
公开(公告)日：2020-07-21
申请号：US15719894
申请日：2017-09-29
申请人： NTT DOCOMO, INC.
IPC分类号： H04W52/24 , H04W24/02 , H04W16/18 , H04B17/21 , H04W52/14 , H04W52/32 , H04B17/318 , H04W16/32 , H04W48/10 , H04W52/50 , H04L5/00 , H04L1/00
摘要： A radio communication method is provided in which a local area base station apparatus, arranged in a wide area where a first carrier frequency is used and forming a local area that is narrower than the wide area, transmits a downlink signal, using a second carrier frequency, which belongs to a different frequency band from the first carrier frequency and which has a wider bandwidth than the first carrier frequency, the local area base station apparatus transmits a detection signal that is used to detect the local area base station apparatus in the mobile terminal apparatus, and the local area base station apparatus transmits the downlink signal for the mobile terminal apparatus with transmission power that is determined based on the path loss of the detection signal received in the mobile terminal apparatus.
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7.发明申请公开(公告)号：US20200067753A1
公开(公告)日：2020-02-27
申请号：US16466216
申请日：2017-12-14
申请人： NTT DOCOMO, INC.
IPC分类号： H04L27/26
摘要： A base station for transmitting a synchronization signal from N transmission antennas (N>=2) in orthogonal frequency division multiple access includes a signal sequence generation unit configured to generate a synchronization signal sequence to be used for the synchronization signal in a frequency domain; a subcarrier mapping unit configured to divide a transmission band of the synchronization signal into K frequency blocks (K>=2) and map the synchronization signal sequence into one or more subcarriers in the K frequency blocks; a precoding unit configured to generate N precoding vectors to be multiplied by the synchronization signal sequence in the frequency domain and multiply the synchronization signal sequence to be transmitted from an n-th antenna (1
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公开(公告)号：US20200036420A1
公开(公告)日：2020-01-30
申请号：US16557354
申请日：2019-08-30
申请人： NTT DOCOMO, INC.
发明人： Yoshihisa Kishiyama , Daiki Takeda
IPC分类号： H04B7/06 , H04B17/24 , H04W24/10 , H04B17/318 , H04B7/0417 , H04B7/08 , H04W16/28
摘要： A user apparatus communicating with a base station in a radio communication system including the base station and the user apparatus includes a first receiving unit to receive multiple first reference signals transmitted from the base station; a detection unit to detect a specific antenna port via which the plurality of first reference signals is received, or a specific directivity pattern, among a plurality of directivity patterns generated by a plurality of antenna ports, in which the plurality of first reference signals are received; a measuring unit to measure reception power of each of the first reference signals; and a transmission unit to group the reception power of each of the first reference signals into one of groups of the specific antenna port and the specific directivity pattern via which the first reference signals are received to transmit the groups of the reception power to the base station.
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9.发明授权公开(公告)号：US10512049B2
公开(公告)日：2019-12-17
申请号：US15661244
申请日：2017-07-27
申请人： NTT DOCOMO, INC.
摘要： The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.
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公开(公告)号：US20190357191A1
公开(公告)日：2019-11-21
申请号：US16531817
申请日：2019-08-05
申请人： NTT DOCOMO, INC.
摘要： A user terminal is disclosed including a first decoding section that decodes a downlink signal for another user terminal from downlink signals for a plurality of user terminals that are non-orthogonal multiplexed over a given radio resource. The user terminal includes a first judgement section that judges whether or not the downlink signal for the other user terminal has been successfully received, based on a decoding result in the first decoding section. The user terminal further includes an interference cancellation section that cancels the decoded downlink signal for the other user terminal from the downlink signals for the plurality of user terminals. The user terminal also includes a second decoding section that decodes a downlink signal for the user terminal, from the downlink signals for the plurality of user terminals, from which the downlink signal for the other user terminal has been canceled in the interference cancellation section.
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