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公开(公告)号：US20170303212A1
公开(公告)日：2017-10-19
申请号：US15513805
申请日：2015-09-25
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Hideaki Takahashi , Satoshi Nagata
CPC classification number: H04W52/325 , H04W16/32 , H04W52/146 , H04W52/346 , H04W52/36 , H04W52/362 , H04W52/367 , H04W52/38 , H04W52/48 , H04W52/50 , H04W72/04 , H04W74/08
Abstract: A user terminal that communicates using a plurality of CGs (Cell Groups) including a first CG and a second CG, includes a PHY layer processing section that controls transmission power of a PRACH (Physical Random Access Channel) in each CG; and a MAC layer processing section that controls retransmission of the PRACH. When total transmission power of PRACHs of the plurality of CGs that are transmitted in an overlapping manner exceeds allowable maximum transmission power, the PHY layer processing section controls so as to preferentially allocate transmission power to the PRACH of the first CG, and based on notification which is reported from the PHY layer processing section when total transmission power of PRACHs of the plurality of CGs that are transmitted in an overlapping manner exceeds allowable maximum transmission power, the MAC layer processing section controls power-ramping in retransmission of the PRACH of the second CG.
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公开(公告)号：US20170303182A1
公开(公告)日：2017-10-19
申请号：US15513008
申请日：2016-02-17
Applicant: NTT DOCOMO, INC.
Inventor： Tooru Uchino , Hideaki Takahashi , Kazuki Takeda , Sadayuki Abeta
CPC classification number: H04W36/36 , H04L5/001 , H04L5/0098 , H04W16/32 , H04W36/0069 , H04W72/0446 , H04W72/1268 , H04W76/27
Abstract: A user apparatus which performs communications with one or more base stations in a communication system which supports carrier aggregation is provided. The user apparatus includes a control unit configured to select a specific cell or a specific cell group as a reference of an uplink transmission carrier switching timing, from a plurality of cells or a plurality of cell groups with which the carrier aggregation is configured; and a transmission unit configured to perform switching from uplink transmission using a first cell carrier to uplink transmission using a second cell carrier based on a transient period timing in the selected specific cell or specific cell group.
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公开(公告)号：US20170295584A1
公开(公告)日：2017-10-12
申请号：US15511268
申请日：2016-02-22
Applicant: NTT DOCOMO, INC.
Inventor： Tooru Uchino , Kazuki Takeda , Hideaki Takahashi
CPC classification number: H04W72/085 , H04L1/0007 , H04L1/1819 , H04L1/1822 , H04L1/1861 , H04L1/1893 , H04L5/001 , H04W28/0236
Abstract: Techniques for controlling a transport block size to implement HARQ sharing are disclosed. One aspect of the present invention relates to a base station, comprising: a cell management unit configured to manage cells for radio communication with user equipment; and a MAC processing unit configured to control a retransmission operation via multiple cells by using HARQ sharing for managing one or more HARQ processes as a common HARQ process, wherein the cell management unit acquires communication quality of multiple HARQ sharing applied cells, and the MAC processing unit controls to activate transmission via the multiple cells with a minimum transmission data size among transmission data sizes corresponding to the acquired communication quality of the respective cells.
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公开(公告)号：US20170280448A1
公开(公告)日：2017-09-28
申请号：US15514012
申请日：2015-09-25
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Satoshi Nagata , Jing Wang , Liu Liu , Huiling Jiang
CPC classification number: H04W72/0446 , H04L1/1854 , H04L1/1861 , H04L5/14 , H04L5/1469 , H04W16/14 , H04W74/0808
Abstract: In order to prevent deterioration in communication quality even when LBT applies to UL transmission, the present invention provides a user terminal that has: a transmission section that transmits a transmission acknowledgement signal for a DL (downlink) data signal transmitted from a radio base station; and a control section that controls transmission of the transmission acknowledgement signal based on an LBT (Listen Before Talk) result in uplink. When transmitting the transmission acknowledgement signal in a given UL (uplink) subframe, the control section determines a feedback timing of the transmission acknowledgement signal in accordance with the LBT result in a UL subframe prior to the given UL subframe.
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公开(公告)号：US20170230976A1
公开(公告)日：2017-08-10
申请号：US15500611
申请日：2015-07-01
Applicant: NTT DOCOMO, INC.
Inventor： Hiroki Harada , Kazuki Takeda , Satoshi Nagata
CPC classification number: H04W72/0446 , H04W28/06 , H04W72/04 , H04W72/0413 , H04W72/042 , H04W72/1273 , H04W72/14
Abstract: The present invention is designed to control UL communication and DL communication flexibly and improve throughput in radio communication. The present invention provides a receiving section that receives uplink data that is transmitted from a user terminal by using an uplink shared channel (PUSCH), a transmission section that transmits downlink control information and downlink data to the user terminal, and a control section that controls scheduling for the user terminal, and the control section controls the transmission of the downlink data using the uplink shared channel (PUSCH).
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Patent Agency Ranking
公开(公告)号：US20170215205A1
公开(公告)日：2017-07-27
申请号：US15328177
申请日：2015-07-03
Applicant: NTT DOCOMO, INC.
Inventor： Kazuaki Takeda , Hiroki Harada , Kazuki Takeda , Satoshi Nagata
CPC classification number: H04W74/0816 , H04B15/00 , H04L5/0048 , H04M11/00 , H04W16/14 , H04W24/08 , H04W48/08 , H04W48/16 , H04W74/08 , H04W88/06
Abstract: The present invention is designed so that the decrease of throughput can be reduced even when LBT is used in a radio communication system which runs LTE/LTE-A and/or the like in an unlicensed band. A radio base station communicates with a user terminal that can use a licensed band and unlicensed band, and has a detection section that detects signals transmitted from other transmission points, an acquiring section that acquires the identification numbers of transmission points corresponding to signals that are detected, and a transmission section that transmits data signals and demodulation reference signals in the unlicensed band, and sequences of the demodulation reference signals are linked with the identification numbers of the transmission points, and the transmission section transmits information about the identification numbers of the other transmission points to the user terminal.
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公开(公告)号：US20170215107A1
公开(公告)日：2017-07-27
申请号：US15329602
申请日：2015-07-29
Applicant: NTT DOCOMO, INC.
Inventor： Yuichi Kakishima , Kazuki Takeda , Satoshi Nagata
CPC classification number: H04W28/18 , H04W28/08 , H04W36/30 , H04W52/0216 , H04W52/146 , H04W52/32 , H04W52/34 , H04W72/04 , H04W72/042 , H04W88/06 , Y02D70/1242 , Y02D70/1262 , Y02D70/1264
Abstract: The present invention is designed so that, even when a user terminal connects with a plurality of radio base stations by employing dual connectivity (DC), the deterioration of uplink communication quality can be reduced. A user terminal communicates with a first radio base station that configures a first cell group and a second radio base station that configures a second cell group, by using dual connectivity, and has a transmission section that transmits an UL signal and/or a UL channel that includes an SRS to each cell group, and a control section that controls the transmission power of the UL signal and/or the UL channel for each cell group, and the control section controls the transmission power of the UL signal and/or the UL channel for each cell group based on the guaranteed power that is configured in at least one of the cell groups.
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公开(公告)号：US20170171825A1
公开(公告)日：2017-06-15
申请号：US15325371
申请日：2015-05-27
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Tooru Uchino , Satoshi Nagata
CPC classification number: H04W52/146 , H04W52/18 , H04W52/322 , H04W52/325 , H04W52/34 , H04W52/38 , H04W52/50 , H04W72/04 , H04W72/0413 , H04W72/0473 , H04W74/004 , H04W74/08
Abstract: The present invention is designed to adequately allocate power to the PRACH in dual connectivity. A user terminal communicates with a plurality of cell groups, each cell group being comprised of one or more cells that use different frequencies, and this user terminal has a transmission section that transmits a physical random access channel (PRACH) in a random access procedure, and a power control section that executes power control for transmitting the PRACH, and when the transmission power required for the PRACH to transmit to a master base station exceeds a threshold, the power control section executes control to stop uplink transmission to a secondary base station.
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199.发明申请公开(公告)号：US20170142668A1
公开(公告)日：2017-05-18
申请号：US15323132
申请日：2015-05-27
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Hiroki Harada , Tooru Uchino , Satoshi Nagata
CPC classification number: H04W52/365 , H04W52/34 , H04W52/367 , H04W52/38 , H04W52/40 , H04W72/0446 , H04W76/15
Abstract: The present invention is designed so that user terminal operations are carried out adequately when guaranteed transmission power is configured in dual connectivity. A user terminal communicates with a plurality of cell groups, where each cell group is comprised of one or more cells that use different frequencies, and has a receiving section that receives the guaranteed transmission power value of each cell and active/non-active information of the cells in the cell groups, and a power control section that controls the guaranteed transmission power values of the cell groups by using the number of cells in the active state and the guaranteed transmission power value of each cell.
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公开(公告)号：US20170118728A1
公开(公告)日：2017-04-27
申请号：US15127186
申请日：2015-03-13
Applicant: NTT DOCOMO, INC.
Inventor： Hiroki Harada , Kazuki Takeda , Tooru Uchino , Satoshi Nagata
CPC classification number: H04W52/38 , H04W16/14 , H04W72/0413 , H04W72/0453 , H04W72/0473 , H04W72/14
Abstract: The present invention is designed to apply UL transmission control adequately in a radio communication system which runs LTE in an unlicensed band (LTE-U). A user terminal communicates with a radio base station by using a licensed band and an unlicensed band, and has a detection section that detects a signal transmitted from another transmission point in the unlicensed band, a control section that controls transmission of a UL signal in the unlicensed band based on a UL transmission command transmitted from the radio base station and the detection result in the detection section, and a transmission section that transmits the UL signal, and the transmission section transmits information related to the detection result to the radio base station by using the licensed band.
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