公开(公告)号：US20180115965A1

公开(公告)日：2018-04-26

申请号：US15564745

申请日：2016-04-08

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Jing Wang ,  Liu Liu ,  Huiling Jiang

IPC: H04W72/04 ,  H04W72/12 ,  H04L5/00

CPC classification number: H04W72/042 ,  H04L5/001 ,  H04L5/0016 ,  H04L5/0037 ,  H04L5/005 ,  H04L5/0053 ,  H04W72/048 ,  H04W72/121 ,  H04W72/1289

Abstract: The present invention is designed so that, in enhanced carrier aggregation, the control information that is required in cross-carrier scheduling can be reduced. A user terminal can communicate with a radio base station by using six or more component carriers, and has a receiving section that receives a downlink control channel, which includes a group DCI (Downlink Control Information) that contains scheduling control information for a plurality of component carriers, and that is comprised of an information field that is common for a plurality of component carriers and an information field that is specific to each component carrier.

公开(公告)号：US20180115399A1

公开(公告)日：2018-04-26

申请号：US15564751

申请日：2016-04-08

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Jing Wang ,  Liu Liu ,  Huiling Jiang

IPC: H04L5/00 ,  H04W72/04

CPC classification number: H04L5/0037 ,  H04L5/001 ,  H04L5/0016 ,  H04L5/0053 ,  H04W72/048 ,  H04W72/121

Abstract: The present invention is designed so that it is possible to prevent the number of times to perform blind decoding from increasing in cross-carrier scheduling in enhanced carrier aggregation. A user terminal can communicate with a radio base station by using six or more component carriers, and has a control section that exerts control so that, when cross-carrier scheduling is configured by the radio base station and the number of component carriers to be scheduled by a scheduling-source component carrier exceeds a predetermined value, a user terminal-specific search space is determined on a per component carrier basis based on higher layer signaling that configures a CIF (Carrier Indicator Field) value in association with a cell index.

公开(公告)号：US20180110059A1

公开(公告)日：2018-04-19

申请号：US15567638

申请日：2016-08-08

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Yuichi Kakishima ,  Xin Wang ,  Chongning Na ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04W72/12

CPC classification number: H04W72/121 ,  H04B7/0452 ,  H04W72/1289

Abstract: According to an aspect of the present invention, there is provided a radio resource scheduling method, wherein the method includes generating format information, wherein the format information specifies a format of resource allocation information, the format corresponding to a number of a plurality of mobile stations that simultaneously perform communication with the radio base station; generating the resource allocation information provided with the format specified by the format information corresponding to radio resources allocated to the plurality of mobile stations; and transmitting, to the plurality of mobile stations, the resource allocation information.

公开(公告)号：US20180109301A1

公开(公告)日：2018-04-19

申请号：US15564810

申请日：2016-04-08

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Yuichi Kakishima ,  Chongning Na ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04B7/0456 ,  H04B7/08

CPC classification number: H04B7/0456 ,  H04B7/0469 ,  H04B7/0478 ,  H04B7/08

Abstract: According to an aspect of the present invention, a mobile station, which carries out communication using a plurality of antenna ports, includes a receiving section configured to receive, from a radio base station, first-amount information that indicates a number of antenna ports in a first dimension, and second-amount information that indicates a number of antenna ports in a second dimension; and a transmitting section configured to transmit, to the radio base station, a precoding matrix codebook index that is obtained using the first-amount information and/or the second-amount information. Accordingly, a mobile station, a radio base station and a radio communication method can be provided in which a precoding matrix for a two-dimensional antenna array can be generated with flexibility.

公开(公告)号：US20180091207A1

公开(公告)日：2018-03-29

申请号：US15564873

申请日：2015-06-11

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Chongning Na ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04B7/06 ,  H04B7/04 ,  H04L25/03

CPC classification number: H04B7/0626 ,  H04B7/0413 ,  H04B7/0469 ,  H04B7/0632 ,  H04B7/0639 ,  H04L25/03343 ,  H04L25/03891

Abstract: A base station that communicates with a user equipment using multiple antenna ports includes an uplink channel estimation unit that estimates uplink channel states, a downlink channel estimation unit that estimates downlink channel states based on the estimated uplink channel states and channel reciprocity of uplink and downlink, a receiver unit that receives from the user equipment CSI feedback information, and a precoder generating unit that determines a precoding matrix of downlink based on Channel State Information (CSI) indicating the estimated downlink channel states and on the CSI feedback information.

公开(公告)号：US09930666B2

公开(公告)日：2018-03-27

申请号：US14996255

申请日：2016-01-15

Applicant: NTT DoCoMo, Inc.

Inventor： Xin Wang ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04W72/04 ,  H04B7/0452 ,  H04W72/12 ,  H04L5/00 ,  H04L1/18

CPC classification number: H04W72/0453 ,  H04B7/0452 ,  H04L1/1812 ,  H04L5/0051 ,  H04L5/0091 ,  H04W72/0406 ,  H04W72/1289

Abstract: The present disclosure provides a method and base station for Multiple User-Multiple Input Multiple Output (MU-MIMO) transmission in a wireless communication system. The base station re-allocates frequency resources of a DMRS port which are allocated to N first data flows to M second data flows, wherein M is greater than N, and N first data flows may be used by N first UEs or less than N first UEs. The base station designates a DMRS port for K second UEs involved in joint scheduling according to the re-allocation result of frequency resources of a DMRS port, and sends information of the designated DMRS port via a downlink control signaling to the K second UEs, where K is lower than M or equal to M.

公开(公告)号：US20170288758A1

公开(公告)日：2017-10-05

申请号：US15507771

申请日：2015-09-15

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Chongning Na ,  Xiaolin Hou ,  Huiling Jiang

IPC: H04B7/06 ,  H04L5/00 ,  H04W24/10

Abstract: Some techniques for implementing estimation of channel states with high accuracy and efficient feedback of the channel states in 3D MIMO are disclosed. One aspect of the present invention relates to user equipment for implementing 3D MIMO (3-Dimensional Multiple-Input Multiple-Output) communication, comprising: a channel state information generation unit configured to measure channel states of antenna ports of 3D MIMO antennas in a base station with reference signals transmitted from the antenna ports and generate channel state information based on the measured channel states; and a channel state information feedback unit configured to use different channel state information feedback means for antenna ports in respective dimensions of the antennas to feed the generated channel state information back to the base station.

公开(公告)号：US20170142667A1

公开(公告)日：2017-05-18

申请号：US15127671

申请日：2015-03-18

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Yuichi Kakishima ,  Tooru Uchino ,  Liu Liu ,  Huiling Jiang ,  Li Zhao ,  Yong Li ,  Mugen Peng ,  Wenbo Wang

IPC: H04W52/36

CPC classification number: H04W52/365 ,  H04L5/001 ,  H04W52/34

Abstract: The present invention is designed to reduce the decrease of uplink throughput in the event a user terminal connects with a plurality of radio base stations. A user terminal (20) according to an example of the present invention provides a user terminal to connect with a plurality of radio base stations including at least a first radio base station and a second radio base station, and this user terminal has a PH report generating section (411) that calculates the PH (Power Headroom) of each radio base station and generates PH reports, and a transmission section (203) that transmits either the PUSCH (Physical Uplink Shared Channel) bandwidth of the first radio base station, a PH report per resource block, or information about the transmission power density, and a PH report for the first radio base station, to the second radio base station.

公开(公告)号：US20170055249A1

公开(公告)日：2017-02-23

申请号：US15113966

申请日：2014-12-09

Applicant: NTT DOCOMO, INC.

Inventor： Shimpei Yasukawa ,  Qin Mu ,  Liu Liu ,  Huiling Jiang

IPC: H04W72/04 ,  H04W4/00 ,  H04L5/00

CPC classification number: H04W72/048 ,  H04L5/0053 ,  H04L5/0055 ,  H04L5/0082 ,  H04L5/0094 ,  H04W4/70 ,  H04W72/0406 ,  H04W72/0413 ,  H04W72/042

Abstract: The present invention aims at reducing or avoiding PUCCH conflict among terminals if a PDSCH and a PDCCH for indicating assignment information required to receive the PDSCH are transmitted in different subframes. One aspect of the present invention relates to a base station for transmitting a physical downlink shared channel and a physical downlink control channel in different subframes, wherein the physical downlink control channel indicates assignment information required to receive the physical downlink shared channel, comprising: a resource assignment information storage unit configured to store resource assignment information for a physical uplink control channel or resource assignment information for a physical downlink control channel; a resource assignment unit configured to assign a resource for the physical downlink control channel with reference to the resource assignment information storage unit such that no conflict arises among physical uplink control channels from multiple mobile stations; and a transmission unit configured to transmit the physical downlink control channel and the physical downlink shared channel.

Abstract translation: 本发明旨在减少或避免终端之间的PUCCH冲突，如果在不同子帧中发送用于指示接收PDSCH所需的分配信息的PDSCH和PDCCH。 本发明的一个方面涉及用于在不同子帧中发送物理下行链路共享信道和物理下行链路控制信道的基站，其中物理下行链路控制信道指示接收物理下行链路共享信道所需的分配信息，包括：资源 分配信息存储单元，被配置为存储用于物理上行链路控制信道的资源分配信息或者用于物理下行链路控制信道的资源分配信息; 资源分配单元，被配置为参考所述资源分配信息存储单元分配用于所述物理下行链路控制信道的资源，使得来自多个移动站的物理上行链路控制信道之间不产生冲突; 以及发送单元，被配置为发送所述物理下行链路控制信道和所述物理下行链路共享信道。

公开(公告)号：US20170005777A1

公开(公告)日：2017-01-05

申请号：US15114172

申请日：2015-01-23

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Kazuki Takeda ,  Satoshi Nagata ,  Liu Liu ,  Qin Mu ,  Huiling Jiang

IPC: H04L5/14 ,  H04L1/18 ,  H04L5/00 ,  H04W72/04

CPC classification number: H04L5/1438 ,  H04L1/1812 ,  H04L5/001 ,  H04L5/0028 ,  H04L5/0092 ,  H04L5/1469 ,  H04W72/0413 ,  H04W72/042 ,  H04W88/02 ,  H04W88/08

Abstract: Some techniques are disclosed for determining downlink control information for use in each cell in carrier aggregation using a FDD cell and a TDD cell together. One aspect of the present invention relates to user equipment, comprising: a transmission and reception unit configured to transmit and receive a radio channel to/from a base station via multiple cells configured for carrier aggregation in accordance with a frequency division duplex (FDD) mode and a time division duplex (TDD) mode; a cell management unit configured to manage the multiple cells; and a communication control unit configured to determine whether a duplex mode applied to a primary cell in the multiple cells is either the FDD mode or the TDD mode and receive and demodulate downlink control information compliant with the determined duplex mode for each carrier aggregation implemented cell.

Abstract translation: 公开了一些用于确定使用FDD小区和TDD小区在一起的载波聚合中的每个小区中使用的下行链路控制信息的技术。 本发明的一个方面涉及用户设备，包括：发送和接收单元，被配置为根据频分双工（FDD）模式，经由配置用于载波聚合的多个小区向基站发送无线电信道 和时分双工（TDD）模式; 配置为管理所述多个小区的小区管理单元; 以及通信控制单元，被配置为确定应用于所述多个小区中的主小区的双工模式是FDD模式还是TDD模式，并且针对每个载波聚合实现的小区接收和解调与所确定的双工模式兼容的下行链路控制信息。