公开(公告)号：US20160285569A1

公开(公告)日：2016-09-29

申请号：US14778121

申请日：2014-02-25

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Yoshihisa Kishiyama ,  Xiang Yun ,  Lan Chen

IPC: H04B17/309 ,  H04W24/08 ,  H04W72/04 ,  H04L5/00

CPC classification number: H04B17/309 ,  H04J11/0056 ,  H04L5/001 ,  H04L5/0048 ,  H04W24/08 ,  H04W72/0453 ,  H04W72/1289

Abstract: The present invention is designed to adequately measure the received quality of small cells on the user terminal side. A radio base station communicates with a user terminal by using a plurality of carriers into which a communication band is divided, and has a generating section that generates reference signals for allowing the user terminal to measure received quality, and an allocation section that controls the allocation of the reference signals, and, when one of the plurality of carriers is made subject to non-transmission, the allocation section configures a zero-power RS in a predetermined resource location of a specific carrier.

Abstract translation: 本发明被设计为适当地测量用户终端侧的小小区的接收质量。 无线基站通过使用分割了通信频带的多个载波与用户终端进行通信，具有生成部，其生成用于允许用户终端测量接收质量的参考信号;以及分配部，其控制分配 的参考信号，并且当所述多个载波中的一个载波被进行非传输时，所述分配部分在特定载波的预定资源位置中配置零功率RS。

公开(公告)号：US20160119816A1

公开(公告)日：2016-04-28

申请号：US14889363

申请日：2014-04-24

Applicant: NTT DOCOMO, INC.

Inventor： Shimpei Yasukawa ,  Kazuaki Takeda ,  Hiroyuki Ishii ,  Xiang Yun ,  Lan Chen

IPC: H04W28/08 ,  H04W28/02 ,  H04W48/18

CPC classification number: H04W28/08 ,  H04L43/0876 ,  H04L47/30 ,  H04W28/0247 ,  H04W28/0268 ,  H04W48/18 ,  H04W48/20

Abstract: The present invention is designed to use radio resources effectively and improve the throughput of a radio communication system even when a plurality of small cells are placed densely. A radio base station controls the connecting cell of a user terminal, and has a selection section that selects candidate cells, the received power and/or the received quality of which in the user terminal is equal to or greater than a predetermined value, and a determining section that calculates the amount of data to transmit to serving user terminals, for each candidate cell, by taking into account the frequency band that is used, and determines a candidate cell where the amount of data is small, as the connecting cell of the user terminal.

Abstract translation: 本发明被设计成即使当密集地放置多个小单元时，也能有效地使用无线电资源并且提高无线电通信系统的吞吐量。 无线基站控制用户终端的连接小区，具有选择候补小区的选择部，用户终端的接收功率和/或其接收质量等于或大于预定值，以及 确定部分，通过考虑所使用的频带，并且确定数据量少的候选小区，为每个候选小区计算向服务用户终端发送的数据量，作为连接小区的连接小区 用户终端。

公开(公告)号：US20160013849A1

公开(公告)日：2016-01-14

申请号：US14771219

申请日：2014-02-18

Applicant: NTT DOCOMO, INC.

Inventor： Yuichi Kakishima ,  Satoshi Nagata ,  Anass Benjebbour ,  Xiang Yun ,  Yu Jiang ,  Lan Chen ,  Ozgun Bursalioglu

IPC: H04B7/04

CPC classification number: H04B7/0478 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0456 ,  H04B7/0473 ,  H04B7/061 ,  H04B7/0617 ,  H04B7/0639

Abstract: Techniques for providing codebooks extended by gain information that can be transmitted in a reduced amount of signaling are disclosed. One aspect of the present invention relates to a user equipment comprising: a transmission and reception unit configured to communicate a radio signal with a base station in accordance with MIMO (Multiple Input Multiple Output) transmission; a codebook storage unit configured to store predefined codebooks to specify precoding matrices for use in the MIMO transmission, wherein the codebooks are arranged to represent phase information and gain information; a channel measurement unit configured to measure channel conditions based on reference signals transmitted from multiple antennas in the base station; and a codebook selection unit configured to select a codebook to be indicated to the base station from the stored codebooks based on the measured channel conditions and instruct the transmission and reception unit to indicate feedback information to the base station, wherein the feedback information includes a codebook index for identifying the selected codebook.

Abstract translation: 公开了用于提供可以以减少的信令量发送的增益信息进行扩展的码本的技术。 本发明的一个方面涉及一种用户设备，包括：发送和接收单元，被配置为根据MIMO（多输入多输出）传输与基站的无线电信号; 码本存储单元，被配置为存储预定码本，以指定在MIMO传输中使用的预编码矩阵，其中所述码本被布置为表示相位信息和增益信息; 信道测量单元，被配置为基于从所述基站中的多个天线发送的参考信号来测量信道状况; 以及码本选择单元，被配置为基于所测量的信道条件从所存储的码本中选择要向基站指示的码本，并且指示发送和接收单元向基站指示反馈信息，其中反馈信息包括码本 用于识别所选码本的索引。

公开(公告)号：US20150103774A1

公开(公告)日：2015-04-16

申请号：US14404084

申请日：2013-04-26

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Lan Chen

IPC: H04B7/06 ,  H04B7/02 ,  H04W72/04

CPC classification number: H04B7/0626 ,  H04B7/024 ,  H04W72/042

Abstract: The present invention is designed to feed back a plurality of pieces of CSI with respect to each transmission point, when CoMP transmission is applied in the framework of carrier aggregation. The radio communication method according to the present invention is a radio communication method in a radio communication system including a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multi-point transmission/reception with the plurality of radio base station apparatuses, and, in this radio communication method, when coordinated multi-point transmission is applied, the radio base station apparatus, transmits CSI set information on a set including at least one CSI through higher layer signaling, and also transmits CSI request information in DCI, and the user terminal feeds back CSI based on the CSI set information and the CSI request information.

Abstract translation: 本发明被设计为当在载波聚合的框架中应用CoMP传输时，相对于每个传输点反馈多个CSI。 根据本发明的无线电通信方法是一种无线通信系统，包括多个无线基站装置和用户终端，该多个无线基站装置和用户终端能够与多个无线基站装置进行协调的多点发送/接收 无线基站装置，在该无线通信方式中，当应用协调的多点传输时，无线基站装置通过高层信令向包含至少一个CSI的集合发送CSI集合信息，并发送CSI请求 DCI中的信息，并且用户终端基于CSI集信息和CSI请求信息反馈CSI。

公开(公告)号：US20140286290A1

公开(公告)日：2014-09-25

申请号：US14356174

申请日：2012-11-01

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Xiaoming She ,  Lan Chen

IPC: H04L1/00 ,  H04L5/00

CPC classification number: H04L1/0026 ,  H04B7/024 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0626 ,  H04L1/0028 ,  H04L1/1671 ,  H04L5/0035 ,  H04L5/0057 ,  H04W76/15

Abstract: To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized in that a radio base station apparatus determines so that content of CSI to transmit to a serving cell to perform CoMP transmission as feedback is different from content of CSI to transmit to a coordinated cell as feedback, and notifies a user terminal of the content of CSI, and that the user terminal generates feedback information based on the content of CSI notified from the radio base station apparatus, and transmits the feedback information to radio base station apparatuses of cells that perform Coordinated Multi-Point transmission.

Abstract translation: 为了在不降低应用CoMP传输的吞吐量的情况下减少CSI反馈的开销，本发明的无线电通信方法的特征在于，无线电基站装置确定使得向服务小区发送的作为反馈的CoMP传输的CSI的内容不同 从CSI的内容发送到协作小区作为反馈，并且向用户终端通知CSI的内容，并且用户终端基于从无线基站装置通知的CSI的内容生成反馈信息，并且发送反馈 信息给执行协调多点传输的小区的无线基站装置。

公开(公告)号：US20140286289A1

公开(公告)日：2014-09-25

申请号：US14356171

申请日：2012-11-01

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Xiaoming She ,  Lan Chen

IPC: H04B7/02 ,  H04W72/08 ,  H04B7/06 ,  H04W24/10

CPC classification number: H04B7/024 ,  H04B7/0626 ,  H04B7/0632 ,  H04B7/065 ,  H04L1/0026 ,  H04L1/0029 ,  H04L1/003 ,  H04L5/0007 ,  H04L5/0035 ,  H04L5/0073 ,  H04W24/10 ,  H04W72/085

Abstract: To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized by including, in a user terminal measuring quality information for each of cells to perform Coordinated Multi-Point transmission, and notifying a radio base station apparatus of the quality information, in the radio base station apparatus calculating a quality difference between the cells to perform Coordinated Multi-Point transmission, by using the quality information for each the cells from the user terminal, determining granularity of inter-cell channel state information for each of the cells based on the quality difference, and notifying the user terminal of the granularity, and, in that the user terminal generating inter-cell channel state information for each of the cells according to the granularity from the radio base station apparatus, and transmitting the inter-cell channel state information for each of the cells to radio base station apparatuses of cells to perform Coordinated Multi-Point transmission.

Abstract translation: 为了减少CSI反馈的开销而不降低应用CoMP传输的吞吐量，本发明的无线电通信方法的特征在于在用户终端中包括测量每个小区的质量信息以执行协调多点传输，并通知无线电基站 在无线基站装置中，通过使用来自用户终端的各小区的质量信息，确定小区间信道状态的粒度，计算出小区之间的质量差进行协调多点发送 基于质量差的每个小区的信息，并且向用户终端通知粒度，并且用户终端根据来自无线基站装置的粒度来生成每个小区的小区间信道状态信息 ，并且将每个小区的小区间信道状态信息发送到rad io基站装置执行协调多点传输。

公开(公告)号：US09716540B2

公开(公告)日：2017-07-25

申请号：US14410973

申请日：2013-06-24

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Jing Wang ,  Xiang Yun ,  Lan Chen

IPC: H04L1/00 ,  H04B7/06 ,  H04L5/00 ,  H04W72/04

CPC classification number: H04B7/0626 ,  H04L5/001 ,  H04L5/0035 ,  H04L5/0048 ,  H04L5/0057 ,  H04L5/0073 ,  H04L5/0094 ,  H04W72/0413

Abstract: To make it possible to feed back channel state information adequately even when a plurality of pieces of channel state information are generated in a user terminal, a user terminal that is configured to be able to conduct coordinated multi-point transmission/reception with a plurality of radio base stations has a generating section that generates a plurality of kinds of channel state information using channel state measurement reference signals transmitted from each radio base station, a selection section that selects predetermined channel state information to feed back, from the plurality of kinds of channel state information, and a transmission section that feeds back the predetermined channel state information to the radio base station via an uplink control channel, and the selection section selects the predetermined channel state information based at least on the priorities assigned to the resource indices of channel state measurement reference signals corresponding to each channel state information.

公开(公告)号：US09634808B2

公开(公告)日：2017-04-25

申请号：US14431411

申请日：2013-08-16

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Mingju Li ,  Xiang Yun ,  Lan Chen

IPC: H04W4/00 ,  H04L5/00 ,  H04L1/00 ,  H04W24/00 ,  H04W28/22 ,  H04W48/00 ,  H04B17/345 ,  H04W84/04 ,  H04W88/08

CPC classification number: H04L5/0035 ,  H04B17/345 ,  H04L1/00 ,  H04L1/0067 ,  H04L5/005 ,  H04L5/0051 ,  H04W24/00 ,  H04W28/22 ,  H04W48/00 ,  H04W84/042 ,  H04W88/08

Abstract: To perform rate matching appropriately even when downlink signals are transmitted from a plurality of transmission points to a user terminal, a radio communication system having a user terminal capable of coordinate multi-point transmission and reception with several radio base stations is provided. A radio base station transmits downlink control information including bit information defining a predetermined rate matching pattern to the user terminal. The user terminal receives the downlink control information and performs rate matching based on the bit information defining the rate matching pattern. A combination of a cell-specific reference signal pattern and an interference measurement reference signal pattern in the case of transmission from several radio base stations each using an MBSFN subframe or NCT is defined in predetermined bits. The user terminal performs rate matching based on the bit information and the subframe configuration and interference measurement reference signal pattern of the radio base station.

公开(公告)号：US09444527B2

公开(公告)日：2016-09-13

申请号：US14356171

申请日：2012-11-01

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Xiaoming She ,  Lan Chen

IPC: G01R31/08 ,  H04B7/02 ,  H04L1/00 ,  H04L5/00 ,  H04B7/06 ,  H04W24/10 ,  H04W72/08

CPC classification number: H04B7/024 ,  H04B7/0626 ,  H04B7/0632 ,  H04B7/065 ,  H04L1/0026 ,  H04L1/0029 ,  H04L1/003 ,  H04L5/0007 ,  H04L5/0035 ,  H04L5/0073 ,  H04W24/10 ,  H04W72/085

Abstract: To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized by including, in a user terminal measuring quality information for each of cells to perform Coordinated Multi-Point transmission, and notifying a radio base station apparatus of the quality information, in the radio base station apparatus calculating a quality difference between the cells to perform Coordinated Multi-Point transmission, by using the quality information for each the cells from the user terminal, determining granularity of inter-cell channel state information for each of the cells based on the quality difference, and notifying the user terminal of the granularity, and, in that the user terminal generating inter-cell channel state information for each of the cells according to the granularity from the radio base station apparatus, and transmitting the inter-cell channel state information for each of the cells to radio base station apparatuses of cells to perform Coordinated Multi-Point transmission.

Abstract translation: 为了减少CSI反馈的开销而不降低应用CoMP传输的吞吐量，本发明的无线电通信方法的特征在于在用户终端中包括测量每个小区的质量信息以执行协调多点传输，并通知无线电基站 在无线基站装置中，通过使用来自用户终端的各小区的质量信息，确定小区间信道状态的粒度，计算出小区之间的质量差进行协调多点发送 基于质量差的每个小区的信息，并且向用户终端通知粒度，并且用户终端根据来自无线基站装置的粒度来生成每个小区的小区间信道状态信息 ，并且将每个小区的小区间信道状态信息发送到rad io基站装置执行协调多点传输。

公开(公告)号：US09319120B2

公开(公告)日：2016-04-19

申请号：US14426321

申请日：2013-07-31

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Yang Song ,  Xiang Yun ,  Lan Chen

IPC: H04B7/02 ,  H04B7/04 ,  H04W16/28 ,  H04B7/06 ,  H04W88/08 ,  H04L5/00

CPC classification number: H04L25/0224 ,  H04B7/0452 ,  H04B7/0456 ,  H04B7/0626 ,  H04L5/0023 ,  H04L5/0048 ,  H04W16/28 ,  H04W88/08

Abstract: The present invention is designed so that it is possible to feed back channel state information (CSI) that is suitable for downlink communication in which 3D beams are used. The radio communication method of the present invention is a radio communication method to allow a radio base station to carry out downlink communication with a user terminal by using a 3D beam that is formed with a horizontal beam having directivity in a horizontal plane and a vertical beam having directivity in a vertical plane, and has the steps in which the radio base station transmits a plurality of measurement reference signals that are pre-coded using different precoding weights between a plurality of vertical beams, and the user terminal transmits channel state information that is generated based on the plurality of measurement reference signals, to the radio base station.

Abstract translation: 本发明被设计为使得可以反馈适用于其中使用3D光束的下行链路通信的信道状态信息（CSI）。 本发明的无线电通信方法是一种无线电通信方法，其允许无线电基站通过使用形成有水平方向性的水平波束和垂直波束的3D波束来执行与用户终端的下行链路通信 具有垂直平面中的方向性，并且具有以下步骤：无线基站发送使用多个垂直波束之间的不同预编码权重进行预编码的多个测量参考信号，并且用户终端发送信道状态信息 基于所述多个测量参考信号生成的所述无线基站。