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公开(公告)号：EP3413486B1
公开(公告)日：2020-04-01
申请号：EP17747461.6
申请日：2017-02-01
申请人： NTT DOCOMO, INC.
IPC分类号： H04J99/00 , H04B17/318 , H04W16/28 , H04W24/10 , H04B7/04 , H04B7/10 , H04B17/24 , H04B7/024 , H04B7/06 , H04J11/00 , H04W72/04 , H04W72/08 , H04L5/00 , H04B17/336 , H04B17/345
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公开(公告)号：EP3422590A1
公开(公告)日：2019-01-02
申请号：EP17763356.7
申请日：2017-03-09
申请人： NTT DOCOMO, INC.
IPC分类号： H04B7/0413 , H04B7/10 , H04L27/26
摘要： There is provided an estimation device including an acquisition unit that acquires a channel estimation value for each combination of all of a plurality of combinations between a plurality of transmission antenna elements included in a base station and a plurality of reception antenna elements included in a mobile station; and an estimation unit that calculates a channel impulse response for each combination of all of the plurality of combinations between the plurality of transmission antenna elements and the plurality of reception antenna elements using the channel estimation values, and that estimates power delay profile by averaging, over all the combinations of the plurality of combinations between the plurality of transmission antenna elements and the plurality of reception antenna elements, power values for the respective combinations that are calculated from the calculated channel impulse responses for the respective combinations.
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公开(公告)号：EP4131653A1
公开(公告)日：2023-02-08
申请号：EP21775949.7
申请日：2021-02-10
申请人： NTT DOCOMO, INC.
摘要： A terminal (200) comprises: a control unit (203) which determines a direction of transmitting a radio wave on the basis of a direction of arrival of a desired wave or a direction of arrival of an interference wave; and a transmission direction restriction unit (205) which is provided near an antenna (204) and restricts the direction of transmitting the radio wave in accordance with the determination of the control unit (203). The transmission direction restriction unit (205) includes a plurality of metasurface units each including a metasurface substrate, and a dielectric substrate arranged to be opposed to the metasurface substrate. The control unit (203) adjusts the distance between the metasurface substrate and the dielectric substrate of each metasurface unit.
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公开(公告)号：EP3419187B1
公开(公告)日：2019-11-27
申请号：EP17763308.8
申请日：2017-03-08
申请人： NTT DOCOMO, INC.
IPC分类号： H04B7/0413 , H04L27/26 , H04W16/28
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公开(公告)号：EP3771278A1
公开(公告)日：2021-01-27
申请号：EP19770387.9
申请日：2019-03-22
申请人： NTT DOCOMO, INC.
IPC分类号： H04W72/12 , H04B7/022 , H04B7/0456 , H04B7/06 , H04W16/28
摘要： Deterioration in communication characteristics is prevented by performing scheduling in which movement/stillness of user terminals is taken into consideration. Received-power measurement section 103 measures the power of a reference signal from each of the user terminals. Movement/stillness determination section 104 determines whether each of the user terminals is a moving terminal or an unmoving terminal based on over-time variations in received power at transmission points for each of the user terminals. Group selection section 105 groups the user terminals into a moving terminal group and an unmoving terminal group, and selects one of the groups as a signal-transmission target. Transmission control section 108 performs open-loop signal processing without precoding when the moving terminal group is selected, or performs closed-loop signal processing with precoding when the unmoving terminal group is selected.
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公开(公告)号：EP3419187A1
公开(公告)日：2018-12-26
申请号：EP17763308.8
申请日：2017-03-08
申请人： NTT DOCOMO, INC.
IPC分类号： H04B7/0413 , H04L27/26 , H04W16/28
摘要： A base station transmits first discovery signals in different transmission directions from the base station through beamforming; transmits, for one or more first transmission directions corresponding to one or more first discovery signals reported from the mobile station, second discovery signals in second transmission directions within a predetermined range from the first transmission direction; and, for transmitting the second discovery signal, transmits the second discovery signal by multiplying, by a correction precoding vector for adding, to the first transmission direction, a transmission angle difference between the first transmission direction within the predetermined range from the second discovery signal and a second transmission direction of the second discovery signal to be transmitted, and by performing beamforming for the second discovery signal to which the correction precoding vector is multiplied, using a first weight matrix for beamforming in the first transmission direction within the predetermined range from the second discovery signal.
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公开(公告)号：EP3783942A1
公开(公告)日：2021-02-24
申请号：EP19789151.8
申请日：2019-04-16
申请人： NTT DOCOMO, INC.
发明人： MASHINO, Jun , OKUYAMA, Tatsuki , SUYAMA, Satoshi
IPC分类号： H04W16/28 , H04B7/024 , H04B7/0413 , H04B7/0426 , H04B7/0452 , H04B7/0456 , H04B7/06 , H04J99/00 , H04W28/16
摘要： A base station device includes a reception point that includes a plurality of antennas, and a control section that selects a plurality of terminals that transmit uplink signals to be received while space-division multiplexed by the plurality of antennas. The control section controls a ratio between a number of first terminals and a number of second terminals in selecting the plurality of terminals, the second terminals being terminals whose rate of the uplink signals is higher than a rate of the uplink signals of the first terminals, the ratio being controlled depending on a target transmit power configured for the first terminals.
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公开(公告)号：EP3771114A1
公开(公告)日：2021-01-27
申请号：EP19770927.2
申请日：2019-03-22
申请人： NTT DoCoMo, Inc.
摘要： When base station 100 detects reception of a plurality of transmission requests for data signals identical in content from a plurality of user terminals 200, base station 100 applies, to the data signals to be transmitted to a plurality of user terminals 200, beamforming for covering a plurality of user terminals 200 by at least one transmission beam, and transmits, by the at least one transmission beam, the data signals to which the beamforming has been applied.
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公开(公告)号：EP3584953A1
公开(公告)日：2019-12-25
申请号：EP17896429.2
申请日：2017-11-20
申请人： NTT DOCOMO, INC.
IPC分类号： H04B7/0456 , H04B7/024 , H04W16/28
摘要： Radio base station 10 in a radio communication system that performs MIMO transmission between a plurality of radio base stations and at least one user terminal 20 includes: precoding section 110 that applies precoding to data signals based on channel information indicating channels between radio base stations 10 and the user terminal; and communication section 112 that transmits the precoded data signals, in which the precoding in a first radio base station of the plurality of radio base stations is applied based on the channel information including at least a channel between the first radio base station and a first user terminal connected to a second radio base station other than the first radio base station.
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公开(公告)号：EP4318961A1
公开(公告)日：2024-02-07
申请号：EP22774701.1
申请日：2022-02-04
申请人： NTT DOCOMO, INC.
摘要： This terminal includes: a reception unit that receives carrier waves from each of a plurality of base stations that transmit signals in coordination with each other; and a control unit that controls the reception frequency of each carrier wave on the basis of a reference signal included in each carrier wave, and that estimates a signal on the basis of the results of decoding carried out for each carrier wave.
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