公开(公告)号：US20150256307A1

公开(公告)日：2015-09-10

申请号：US14431411

申请日：2013-08-16

Applicant: NTT DOCOMO, INC.

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

IPC: H04L5/00

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.

Abstract translation: 即使在从多个发送点向用户终端发送下​​行链路信号的情况下，也能适当地进行速率匹配，具有能够与多个无线基站进行多点发送接收的用户终端的无线通信系统。 无线基站向用户终端发送包含定义了预定速率匹配模式的比特信息的下行控制信息。 用户终端接收下行链路控制信息，并根据定义速率匹配模式的比特信息进行速率匹配。 在使用MBSFN子帧或NCT的几个无线基站的发送的情况下，以规定的比特来定义小区特定参照信号模式与干扰测量基准信号模式的组合。 用户终端基于无线基站的比特信息和子帧配置和干扰测量参考信号模式进行速率匹配。

公开(公告)号：US20150222340A1

公开(公告)日：2015-08-06

申请号：US14426321

申请日：2013-07-31

Applicant: NTT DOCOMO, INC.

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

IPC: H04B7/04 ,  H04W16/28

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。

公开(公告)号：US20150085770A1

公开(公告)日：2015-03-26

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

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：US20150018034A1

公开(公告)日：2015-01-15

申请号：US14375573

申请日：2013-01-24

Applicant: NTT DOCOMO, INC.

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

IPC: H04B7/06 ,  H04W24/08

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。