-
1.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
Applicant: NTT DOCOMO, INC.
Inventor： Shimpei Yasukawa , Satoshi Nagata , Yoshihisa Kishiyama , Hiroyuki Ishii
Abstract: 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.
-
公开(公告)号：US10462781B2
公开(公告)日：2019-10-29
申请号：US15024896
申请日：2014-09-22
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Hiroki Harada , Satoshi Nagata , Hiroyuki Ishii
Abstract: The present invention is designed to carry out uplink transmission adequately even when CA is executed by applying different duplex modes between multiple cells. A user terminal communicates with an FDD cell and a TDD cell that employ carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, and a feedback control section that allocates and feeds back delivery acknowledgement signals in response to the DL signals in a predetermined UL subframe, and, regardless of which cell is configured as a primary cell, the feedback control section, when transmitting only a delivery acknowledgement signal in response to the DL signal of one cell, transmits the delivery acknowledgement signal from the one cell by using a PUCCH resource that is determined from a downlink control channel resource of the DL signal, and, when transmitting delivery acknowledgement signals in response to the DL signals of both cells, transmits the delivery acknowledgement signals by using a PUCCH resource of one or both of the cells.
-
公开(公告)号：US10103865B2
公开(公告)日：2018-10-16
申请号：US15024655
申请日：2014-09-19
Applicant: NTT DOCOMO, INC.
Inventor： Kazuki Takeda , Satoshi Nagata , Hiroyuki Ishii
Abstract: The present invention is designed to enable appropriate transmission and reception in user terminals even when CA is executed by applying different duplex modes between multiple cells. A user terminal communicates with an FDD cell and a TDD cell by using carrier aggregation, and has a transmitting/receiving section that receives DL signals transmitted from each cell and transmits UL signals to each cell, and a report control section that controls reporting of capability information regarding simultaneous transmission and reception of the DL signals and UL signals in the transmitting/receiving section. The report control section controls reporting of the capability information regarding simultaneous transmission and reception of the transmitting/receiving section with respect to every combination of a frequency band to use in the FDD cell and a frequency band to use in the TDD cell.
-
公开(公告)号：US09955513B2
公开(公告)日：2018-04-24
申请号：US14439984
申请日：2013-10-04
Applicant: NTT DOCOMO, INC.
Inventor： Jinho Kim , Hiroto Yasuda , Yasufumi Morioka , Hideaki Takahashi , Junichiro Hagiwara , Hiroyuki Ishii
CPC classification number: H04W76/15 , H04W74/002 , H04W76/10 , H04W76/12 , H04W88/16
Abstract: A radio communication system includes at least one user equipment, a first base station, a second base station, a first gateway, a second gateway, and a switching station. The switching station decides whether or not a gateway through which communication executed by the user equipment should be routed is the second gateway. In a case in which it is decided that the gateway through which communication executed by the user equipment should be routed is the second gateway, the switching station executes control for establishing a first user path for uplink and a second user path that is a radio path. The second base station executes control for establishing a first user path for downlink.
-
公开(公告)号：US09883536B2
公开(公告)日：2018-01-30
申请号：US14760128
申请日：2013-12-05
Applicant: NTT DOCOMO, INC.
Inventor： Tooru Uchino , Sadayuki Abeta , Kazuaki Takeda , Hiroyuki Ishii
CPC classification number: H04W74/085 , H04W8/26 , H04W16/32
Abstract: A system and method to prevent collision between mobile stations to which the same C-RNTI is allocated in a simple implementation while avoiding a problem of C-RNTI depletion in a phantom cell is disclosed. A radio base station includes an allocation unit configured to allocate multiple C-RNTIs to each of mobile stations, and the allocation unit performs adjustment such that collision of search spaces to which PDCCH resources are allocated does not occur among the multiple mobile stations.
-
Patent Agency Ranking
公开(公告)号：US20170135039A1
公开(公告)日：2017-05-11
申请号：US15127520
申请日：2015-03-13
Applicant: NTT DOCOMO, INC.
Inventor： Kazuaki Takeda , Hiroki Harada , Hiroyuki Ishii
CPC classification number: H04W52/0225 , H04L5/0048 , H04W16/32 , H04W52/02 , H04W52/0206 , H04W72/042 , H04W72/0446 , H04W72/12 , H04W76/27 , Y02D70/00 , Y02D70/1262 , Y02D70/1264
Abstract: The present invention is designed to reduce the delay time which a small cell takes before starting transmitting data to a user terminal. A user terminal according to the present invention has a measurement section that, when the state of connection with the small base station is a deactivated state, periodically measures channel state information, by using a channel state information reference signal that is transmitted from the small base station, and a monitoring section that, when the state of connection is the deactivated state, periodically monitors a downlink control channel that is transmitted from the small base station, wherein, when downlink control information for the user terminal is detected by the periodic monitoring of the downlink control channel, the state of connection is switched from the deactivated state to an activated state.
-
公开(公告)号：US20170118684A1
公开(公告)日：2017-04-27
申请号：US15400658
申请日：2017-01-06
Applicant: NTT DOCOMO, INC.
Inventor： Hiroyuki Ishii
CPC classification number: H04W36/04 , H04W8/082 , H04W16/14 , H04W28/0215 , H04W36/22 , H04W36/38 , H04W76/10 , H04W76/14 , H04W76/18 , H04W76/20 , H04W76/30 , H04W84/045
Abstract: In a cellular telecommunications network, a mobile communication system to offload data traffic from base stations to small-node devices, includes a radio base station, a plurality of small-node devices, a macro-base-station-to-the-small-node-device (BS2D) communication section configured to receive a first control-plane message from the radio base station over a BS2D communication link, a small-node-device-to-user-equipment (D2UE) communication section configured to transmit user-plane data to a user equipment over a wireless D2UE communication link established responsive to the first control-plane message, and a center small-node device. The center small-node device includes a buffer section, a backhaul communication section configured to receive the user-plane traffic data from a server over a backhaul link, and is configured to manage D2UE connections between the plurality of small-node devices and the mobile station, buffer data to be transmitted in downlink and uplink for the plurality of small-node devices, and conduct a link adaptation for the D2UE connections.
-
公开(公告)号：US09549422B2
公开(公告)日：2017-01-17
申请号：US14424110
申请日：2013-08-19
Applicant: NTT DOCOMO, INC.
Inventor： Tooru Uchino , Sadayuki Abeta , Hiroyuki Ishii
CPC classification number: H04W76/021 , H04W8/26 , H04W16/02 , H04W16/30 , H04W52/244
Abstract: Even when a same C-RNTI is allocated to multiple mobile stations in a phantom cell, a collision between the mobile stations UE to which the same C-RNTI is allocated is avoided. A radio base station PhNB#10 according to the present invention is configured to manage a cell #10 (phantom cell) which is formed by linking multiple small cells and includes an allocation unit 11 configured to allocate a same C-RNTIph to multiple mobile stations UE#1/UE#3 which are separated by at least a predetermined distance in the cell #10.
Abstract translation: 即使在幻象小区中分配了多个移动台，也分配了相同的C-RNTI，因此避免了分配了相同C-RNTI的移动台UE之间的冲突。 根据本发明的无线基站PhNB＃10被配置为管理通过链接多个小小区而形成的小区＃10（幻像小区），并且包括被配置为向多个移动站分配相同的C-RNTIph的分配单元11 UE＃1 / UE＃3，其在小区＃10中被隔开至少预定的距离。
-
公开(公告)号：US20160278021A1
公开(公告)日：2016-09-22
申请号：US14777767
申请日：2014-02-19
Applicant: NTT DOCOMO, INC.
Inventor： Kazuaki Takeda , Yuta Sagae , Satoshi Nagata , Yoshihisa Kishiyama , Hiroyuki Ishii
CPC classification number: H04W52/241 , H04B17/24 , H04B17/318 , H04L5/0032 , H04L5/005 , H04L5/0057 , H04W52/143 , H04W52/267 , H04W52/32 , H04W72/0413 , H04W72/085
Abstract: The present invention is designed to allow adequate communication even when a plurality of cells employ downlink transmission power control. A user terminal communicates with a radio base station that executes downlink transmission power control, and includes a receiving section that receives a first reference signal which is transmitted with fixed transmission power, and a second reference signal to which the downlink transmission power control is applied, a measurement section that measures the received power of the first reference signal and the second reference signal, and a transmission section that feeds back information related to the received power of the first reference signal and the second reference signal as a measurement report.
Abstract translation: 本发明被设计为即使当多个小区采用下行链路传输功率控制时也允许充分的通信。 用户终端与执行下行链路发送功率控制的无线基站进行通信，并且包括：接收部，其接收以固定发送功率发送的第一基准信号;以及接收部，其接收应用了所述下行发送功率控制的第二参考信号; 测量部分，测量第一参考信号和第二参考信号的接收功率;以及发送部分，反馈与第一参考信号和第二参考信号的接收功率有关的信息作为测量报告。
-
10.发明授权公开(公告)号：US09398522B2
公开(公告)日：2016-07-19
申请号：US14416368
申请日：2013-07-17
Applicant: NTT DOCOMO, INC.
Inventor： Tooru Uchino , Hiroyuki Ishii
Abstract: A “macro-assisted cell” adaptable to multiple operation modes is realized. In a mobile station (UE) of the invention, a control unit (22) is configured to start communication in a small cell on the basis of MIB/SIB of the small cell when a sequence in a “discovery signal” is determined as a sequence for a “stand-alone cell.” The control unit (22) is configured to start the communication in the small cell on the basis of a control signal from a macro cell when the sequence in the “discovery signal” is determined as a sequence for a “macro-assisted cell.”
Abstract translation: 实现了适用于多种操作模式的“宏辅助单元”。 在本发明的移动台（UE）中，控制单元（22）被配置为当“发现信号”中的序列被确定为小时，在小单元的MIB / SIB的基础上开始小小区中的通信 “独立单元”的顺序。控制单元（22）被配置为当“发现信号”中的顺序被确定为一个单元时，基于来自宏小区的控制信号在小单元中开始通信 “宏观辅助细胞”的序列。
-
-
-
-
-
-
-
-
-
Search Results
97
records
(took 0.03 seconds)
