公开(公告)号：US20150341949A1

公开(公告)日：2015-11-26

申请号：US14410997

申请日：2013-06-24

Applicant: NTT DOCOMO, INC.

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

IPC: H04W72/12 ,  H04B7/02

CPC classification number: H04W72/1252 ,  H04B7/024 ,  H04L1/0013 ,  H04L1/0067 ,  H04L5/0035 ,  H04L5/0053 ,  H04L5/0058 ,  H04L5/0085 ,  H04L5/0087 ,  H04L5/0094 ,  H04L5/0098 ,  H04L2001/0092 ,  H04W16/28 ,  H04W72/12 ,  H04W72/1289

Abstract: In order to signal information that is required in rate matching efficiently, even when CoMP transmission/reception techniques are employed, CoMP transmission is scheduled, in which a plurality of radio base station apparatuses (eNBs) serve as transmission points and carry out coordinated multi-point transmission with respect to a user terminal (UE), downlink control information is generated, in which a rate matching pattern is incorporated, in a physical downlink control channel, based on a table, in which rate matching patterns that are required are mapped to bit data in association with transmission modes in CoMP transmission, a physical downlink control channel is transmitted and also a physical downlink shared data channel is transmitted, to the user terminal (UE), and in the user terminal (UE), the rate matching pattern incorporated in the downlink control information, is specified, based on a table of the same contents as in the radio base station apparatuses (eNBs).

Abstract translation: 为了有效地发送速率匹配所需的信息，即使采用CoMP发送/接收技术，调度CoMP传输，其中多个无线基站装置（eNB）作为发送点， 基于表格，在物理下行链路控制信道中生成其中包含速率匹配模式的下行链路控制信息，其中将所需的速率匹配模式映射到 在CoMP传输中与传输模式相关联的位数据，发送物理下行链路控制信道，并且向用户终端（UE）发送物理下行链路共享数据信道，并且在用户终端（UE）中，速率匹配模式 基于与无线基站装置（eNB）相同的内容的表来指定并入下行链路控制信息。

公开(公告)号：US20150109985A1

公开(公告)日：2015-04-23

申请号：US14384451

申请日：2013-03-12

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Yu Jiang ,  Lan Chen

IPC: H04W72/08 ,  H04L1/16 ,  H04W72/00

CPC classification number: H04W72/085 ,  H04B7/024 ,  H04B7/0623 ,  H04B7/0632 ,  H04L1/0026 ,  H04L1/0039 ,  H04L1/1607 ,  H04L1/1657 ,  H04W72/005

Abstract: The present invention is designed to prevent the decrease of throughput and also reduce the overhead of CSI feedback when CoMP transmission is applied. A radio base station is configured to be able to perform coordinated multiple-point transmission/reception with a user terminal, and includes a detection section configured to detect a retransmission control signal fed back from the user terminal, and a CQI updating section configured to update a CQI for coordinated multiple-point transmission/reception using received quality information in each cell, and the CQI updating section updates the CQI using a calculating formula that is defined with the received quality information in each cell and a variable which changes the value depending on the content of the retransmission control signal.

Abstract translation: 本发明旨在防止吞吐量的降低，并且还降低了应用CoMP传输时CSI反馈的开销。 无线基站被配置为能够与用户终端进行协调的多点发送/接收，并且包括：检测部，被配置为检测从用户终端反馈的重发控制信号; CQI更新部，被配置为更新 使用每个小区中的接收质量信息进行协调的多点发送/接收的CQI，并且CQI更新部分使用每个小区中接收到的质量信息定义的计算公式来更新CQI，以及根据 重传控制信号的内容。

公开(公告)号：US10069651B2

公开(公告)日：2018-09-04

申请号：US15065081

申请日：2016-03-09

Applicant: NTT DOCOMO, INC.

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

IPC: H04L25/02 ,  H04W16/28 ,  H04B7/0452 ,  H04B7/0456 ,  H04B7/06 ,  H04W88/08 ,  H04L5/00

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.

公开(公告)号：US09979454B2

公开(公告)日：2018-05-22

申请号：US14404084

申请日：2013-04-26

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Xiang Yun ,  Lan Chen

IPC: H04B7/06 ,  H04W72/04 ,  H04B7/024

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.

公开(公告)号：US09838908B2

公开(公告)日：2017-12-05

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: H04W72/00 ,  H04W28/08 ,  H04W48/20 ,  H04W28/02 ,  H04W48/18 ,  H04L12/26 ,  H04L12/835

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.

公开(公告)号：US09509462B2

公开(公告)日：2016-11-29

申请号：US14386982

申请日：2013-03-21

Applicant: NTT DOCOMO, INC.

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

IPC: H04L5/00 ,  H04W24/10 ,  H04W28/06 ,  H04W28/16 ,  H04B7/02 ,  H04W4/00 ,  H04B7/06

CPC classification number: H04L5/0035 ,  H04B7/024 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/065 ,  H04B7/066 ,  H04L5/0057 ,  H04W24/10 ,  H04W28/06 ,  H04W28/16

Abstract: The present invention is designed to, upon updating CQIs that are fed back, prevent the increase of the overhead of feedback information, and still improve the accuracy of the updated CQIs when CoMP transmission is applied. The radio communication system of the present invention is formed with a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, and the user terminal acquires channel state information of multiple cells, generates feedback information such that the channel state information of multiple cells is allotted and transmitted in a plurality of subframes, and feeds back the generated feedback information to the radio base station apparatus of one of the multiple coordinated points, using a physical uplink shared data channel.

Abstract translation: 本发明设计为在更新反馈的CQI时，防止反馈信息的开销的增加，并且当应用CoMP传输时，仍然提高更新的CQI的精度。 本发明的无线通信系统由多个无线基站装置和用户终端构成，能够与多个无线基站装置进行协调的多点发送接收，用户终端取得 产生多个小区的信道状态信息，生成反馈信息，使得多个小区的信道状态信息在多个子帧中被分配和发送，并将生成的反馈信息反馈到多个协调点之一的无线基站装置， 使用物理上行链路共享数据信道。

公开(公告)号：US09426819B2

公开(公告)日：2016-08-23

申请号：US14410997

申请日：2013-06-24

Applicant: NTT DOCOMO, INC.

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

IPC: H04L1/00 ,  H04W72/12 ,  H04B7/02 ,  H04W16/28 ,  H04L5/00

CPC classification number: H04W72/1252 ,  H04B7/024 ,  H04L1/0013 ,  H04L1/0067 ,  H04L5/0035 ,  H04L5/0053 ,  H04L5/0058 ,  H04L5/0085 ,  H04L5/0087 ,  H04L5/0094 ,  H04L5/0098 ,  H04L2001/0092 ,  H04W16/28 ,  H04W72/12 ,  H04W72/1289

Abstract: In order to signal information that is required in rate matching efficiently, even when CoMP transmission/reception techniques are employed, CoMP transmission is scheduled, in which a plurality of radio base station apparatuses (eNBs) serve as transmission points and carry out coordinated multi-point transmission with respect to a user terminal (UE), downlink control information is generated, in which a rate matching pattern is incorporated, in a physical downlink control channel, based on a table, in which rate matching patterns that are required are mapped to bit data in association with transmission modes in CoMP transmission, a physical downlink control channel is transmitted and also a physical downlink shared data channel is transmitted, to the user terminal (UE), and in the user terminal (UE), the rate matching pattern incorporated in the downlink control information, is specified, based on a table of the same contents as in the radio base station apparatuses (eNBs).

Abstract translation: 为了有效地发送速率匹配所需的信息，即使采用CoMP发送/接收技术，调度CoMP传输，其中多个无线基站装置（eNB）作为发送点， 基于表格，在物理下行链路控制信道中生成其中包含速率匹配模式的下行链路控制信息，其中将所需的速率匹配模式映射到 在CoMP传输中与传输模式相关联的位数据，发送物理下行链路控制信道，并且向用户终端（UE）发送物理下行链路共享数据信道，并且在用户终端（UE）中，速率匹配模式 基于与无线基站装置（eNB）相同的内容的表来指定并入下行链路控制信息。

公开(公告)号：US20160191273A1

公开(公告)日：2016-06-30

申请号：US15065081

申请日：2016-03-09

Applicant: NTT DOCOMO, INC.

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

IPC: H04L25/02 ,  H04B7/06

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.

公开(公告)号：US09312984B2

公开(公告)日：2016-04-12

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 ,  H04W4/00 ,  H04L5/00 ,  H04B7/02 ,  H04B7/06 ,  H04L1/16

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：US09306650B2

公开(公告)日：2016-04-05

申请号：US14375573

申请日：2013-01-24

Applicant: NTT DOCOMO, INC.

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

IPC: H04B7/00 ,  H04B7/06 ,  H04W24/08 ,  H04L5/00 ,  H04B7/02

CPC classification number: H04B7/0626 ,  H04B7/024 ,  H04L5/0035 ,  H04L5/0057 ,  H04L5/0073 ,  H04W24/08

Abstract: The present invention is designed to prevent the decrease of throughput and also reduce the overhead of CSI feedback when CoMP transmission is applied. In a radio communication system including a plurality of radio base station apparatuses and a user terminal that is configured to be able to carry out coordinated multiple-point transmission/reception with the plurality of radio base station apparatuses, the radio base station apparatus designates a plurality of candidate values of predetermined inter-cell channel state information and reports them to the user terminal, and the user terminal measures inter-cell channel state information of each cell, and also selects a specific candidate value that is close to the measurement value of inter-cell channel state information from the plurality of candidate values that have been reported, and feeds back the specific candidate value to the radio base station apparatus.

Abstract translation: 本发明旨在防止吞吐量的降低，并且还降低了应用CoMP传输时CSI反馈的开销。 在包括多个无线基站装置和被配置为能够与多个无线基站装置进行协调的多点发送/接收的用户终端的无线通信系统中，无线基站装置指定多个 的预定小区间信道状态信息的候选值，并将其报告给用户终端，用户终端测定各小区的小区间信道状态信息，并且还选择接近inter的小区间信道状态信息的测量值的特定候选值 - 来自已经报告的多个候选值的单元信道状态信息，并将特定候选值反馈给无线基站装置。