公开(公告)号：US10075943B2

公开(公告)日：2018-09-11

申请号：US15024594

申请日：2014-09-10

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Hiroyuki Ishii

IPC: H04L1/00 ,  H04W72/04 ,  H04L5/00 ,  H04W74/08 ,  H04L5/14 ,  H04L1/16 ,  H04L1/18 ,  H04W72/12

CPC classification number: H04W72/0413 ,  H04L1/1671 ,  H04L1/1861 ,  H04L5/00 ,  H04L5/0055 ,  H04L5/0057 ,  H04L5/14 ,  H04W72/0446 ,  H04W72/12 ,  H04W72/1226 ,  H04W74/08

Abstract: The present invention is designed so that uplink transmission is carried out adequately even when CA to apply different duplex modes between multiple cells is executed. A user terminal communicates with an FDD cell and a TDD cell by employing carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, a transmission control section that allocates and transmits delivery acknowledgement signals in response to the received DL signals, channel quality information or scheduling requests in predetermined UL subframes, and, when a UL subframe is configured in both the FDD cell and the TDD cell, the transmission control section transmits a delivery acknowledgement signal in one UL subframe or both UL subframes, and controls whether or not to transmit channel quality information or a scheduling request having an overlapping transmission timing with the delivery acknowledgement signal.

公开(公告)号：US10050766B2

公开(公告)日：2018-08-14

申请号：US15024702

申请日：2014-09-19

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Satoshi Nagata ,  Hiroyuki Ishii

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

Abstract: The present invention is designed so that uplink transmission is carried out 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 by using carrier aggregation, and has a receiving section that receives DL signals transmitted from the cells, and a feedback control section that allocates and feeds back transmission acknowledgment signals in response to each DL signal in an uplink control channel of a predetermined cell, with reference to tables in which at least the states of transmission acknowledgment signals, PUCCH resources and QPSK symbol points are associated with each other, and, in this user terminal, the tables define different contents between the FDD cell and the TDD cell, and regardless of the cell where downlink control information is detected and the cell where downlink shared data is detected, the feedback control section uses the table that corresponds to the duplex mode of the predetermined cell where the transmission acknowledgment signals are transmitted.

公开(公告)号：US10045242B2

公开(公告)日：2018-08-07

申请号：US15024874

申请日：2014-09-04

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Hiroyuki Ishii

IPC: H04W4/00 ,  H04W24/10 ,  H04W52/34 ,  H04B17/318 ,  H04L5/00 ,  H04W28/06 ,  H04W84/04

Abstract: The present disclosure is designed to reduce the load of inter-frequency measurements in user terminals in a radio communication system in which a plurality of component carriers (CCs) are used in each small cell within a macro cell. The inter-frequency measurement method of the present disclosure includes the steps of, from a radio base station forming a macro cell to a user terminal, transmitting the transmission timing information of a detection signal in a small cell, and a timing shift value for detection signals of the plurality of CCs that transmitted with shifted timings in the small cell, and, in the user terminal, measuring the plurality of CCs in a measurement gap based on the transmission timing information and the timing shift value.

公开(公告)号：US09603111B2

公开(公告)日：2017-03-21

申请号：US14759257

申请日：2013-10-22

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Satoshi Nagata ,  Yoshihisa Kishiyama ,  Yukihiko Okumura ,  Hiroyuki Ishii

IPC: H04W56/00 ,  H04W48/10 ,  H04W48/16

CPC classification number: H04W56/0015 ,  H04W48/10 ,  H04W48/16

Abstract: A radio communication system includes a first base station that is identified by a first cell identity, a second base station that is identified by a second cell identity, and a user device that can perform radio communication with each of the base stations. The user device detects a first transmission timing based on a first synchronization signal from the first base station and establishes synchronization with the first base station. The first base station notifies the user device of synchronization state information related to a synchronization state with the second base station and of frequency information related to an identification signal frequency that is used by the second base station to transmit an identification signal. The user device, based on the synchronization state information, performs identifying processing, on the identification signal frequency indicated by the frequency information, to identify the second cell identity indicated by the identification signal.

公开(公告)号：US09451520B2

公开(公告)日：2016-09-20

申请号：US14375274

申请日：2013-01-30

Applicant: NTT DOCOMO, INC.

Inventor： Hideaki Takahashi ,  Kazuaki Takeda ,  Takeshi Nakamori ,  Hiroyuki Ishii

IPC: H04W36/30 ,  H04W36/16 ,  H04L5/00 ,  H04W36/00 ,  H04W16/32

CPC classification number: H04W36/30 ,  H04L5/001 ,  H04W16/32 ,  H04W36/0094 ,  H04W36/165

Abstract: Appropriate performance is required for “Inter-Frequency Measurement” in accordance with the conditions of a cell to be subjected to “Inter-Frequency Measurement”. A mobile communication system according to the present invention is configured to separately specify the performance required for “Inter-Frequency Measurement” to be used in “Inter-frequency Handover” control between macrocells #11 and #12 and the performance required for “Inter-frequency Handover” to the cell #11B which is not set as an Scell within the coverage area of the macrocell #11.

Abstract translation: 根据要进行“频率间测量”的单元的条件，进行“频率间测量”需要适当的性能。 根据本发明的移动通信系统被配置为分别指定要在宏单元＃11和＃12之间的“频间切换”控制中使用的“同频测量”所需的性能和“间频测量”所需的性能， 频率切换“到在宏小区＃11的覆盖区域内未设置为Scell的小区＃11B。

公开(公告)号：US20160262091A1

公开(公告)日：2016-09-08

申请号：US15024916

申请日：2014-09-04

Applicant: NTT DOCOMO, INC.

Inventor： Hiroki Harada ,  Kazuaki Takeda ,  Satoshi Nagata ,  Hiroyuki Ishii

IPC: H04W48/16 ,  H04W16/32 ,  H04J11/00 ,  H04W48/12

CPC classification number: H04W48/16 ,  H04J11/0069 ,  H04J11/0073 ,  H04J11/0083 ,  H04W16/32 ,  H04W24/10 ,  H04W48/12

Abstract: The present invention is designed so that adequate radio communication is carried out even when discovery signals for existing user terminals and small cell discovery/measurement signals coexist. A base station forms a macro cell having a coverage area to include a small cell, and communicates with a user terminal that can connect with the small cell, and this base station has a commanding section that commands, with respect to a predetermined frequency, one or both of a first discovery process to use a synchronization signal transmitted from the small cell, and a second discovery process to use a discovery/measurement signal transmitted from the small cell, to the user terminal, and a transmitting section that, when the commanding section commands the second discovery process, transmits information about the parameters of the discovery/measurement signal to the user terminal.

Abstract translation: 本发明被设计成即使当现有用户终端和小型小区发现/测量信号的发现信号共存时也能进行适当的无线电通信。 基站形成具有包括小小区的覆盖区域的宏小区，并与可与小小区连接的用户终端进行通信，该基站具有命令部，对于规定的频率， 或者使用从小小区发送的同步信号的第一发现处理和使用从小小区发送的发现/测量信号到用户终端的第二发现处理以及发送部， 命令第二发现过程，将关于发现/测量信号的参数的信息发送到用户终端。

公开(公告)号：US09419771B2

公开(公告)日：2016-08-16

申请号：US14374966

申请日：2013-01-30

Applicant: NTT DOCOMO, INC.

Inventor： Kazuaki Takeda ,  Yoshihisa Kishiyama ,  Sadayuki Abeta ,  Hiroyuki Ishii

IPC: H04W88/02 ,  H04L5/00 ,  H04J11/00 ,  H04W24/08 ,  H04W72/04

CPC classification number: H04L5/0073 ,  H04J11/0093 ,  H04L5/001 ,  H04L5/0035 ,  H04L5/005 ,  H04W24/08 ,  H04W72/042 ,  H04W76/15 ,  H04W88/02

Abstract: The present invention is designed to detect an S-cell efficiently, in a short time, upon carrier aggregation in a HetNet. In a communication system where carrier aggregation is executed between a first carrier (CC #1) and a second carrier (CC #2), a macro base station apparatus (20A) generates a carrier detection signal that makes a mobile terminal apparatus (10) detect the second carrier (CC #2), such that carrier aggregation is executed with the first carrier (CC #1), and transmits the carrier detection signal to an RRH base station apparatus (20B) such that the carrier detection signal is transmitted from the RRH base station apparatus (20B) to the mobile terminal apparatus (10) in the second carrier (CC #2) in which the carrier detection signal can be allocated with a higher density than a reference signal of the first carrier (CC #1). The macro base station apparatus (20A) detects an S-cell based on the received quality of the carrier detection signal fed back from the mobile terminal apparatus (10).

Abstract translation: 本发明旨在在短时间内有效地在HetNet中的载波聚合上有效地检测S单元。 在第一载波（CC＃1）和第二载波（CC＃2）之间执行载波聚合的通信系统中，宏基站装置（20A）生成使移动终端装置（10）的载波检测信号， 检测第二载波（CC＃2），使得利用第一载波（CC＃1）执行载波聚合，并将载波检测信号发送到RRH基站装置（20B），使得载波检测信号从 所述RRH基站装置（20B）向所述第二载波（CC＃2）中的所述移动终端装置（10）提供载波检测信号，其中所述载波检测信号的密度高于所述第一载波（CC＃1）的参考信号 ）。 宏基站装置（20A）基于从移动终端装置（10）反馈的载波检测信号的接收质量检测S信元。

公开(公告)号：US20160234004A1

公开(公告)日：2016-08-11

申请号：US15024976

申请日：2014-09-19

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroyuki Ishii

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

CPC classification number: H04L5/14 ,  H04L1/1854 ,  H04L5/001 ,  H04L5/0055 ,  H04L5/1469 ,  H04W72/0413 ,  H04W72/0446

Abstract: The present invention is designed so that uplink transmission is carried out adequately even when CA to apply different duplex modes between multiple cells is executed. A user terminal communicates with an FDD cell and a TDD cell by employing carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, and a feedback control section that allocates delivery acknowledgement signals in response to the DL signals received, by allocating the delivery acknowledgment signals in a predetermined UL subframe, and, regardless of the cell that is configured as the primary cell, when UL subframes are configured in both the FDD cell and the TDD cell, the feedback control section feeds back the delivery acknowledgement signals by using a UL subframe of one or both of the cells, and, when a UL subframe is configured only in the FDD cell, the feedback control section feeds back the delivery acknowledgement signals by using the UL subframe of the FDD cell.

Abstract translation: 本发明被设计成即使执行在多个小区之间应用不同双工模式的CA时也能够进行上行链路传输。 用户终端通过采用载波聚合与FDD小区和TDD小区进行通信，并具有接收从每个小区发送的DL信号的接收部分，以及响应于所接收的DL信号分配送达确认信号的反馈控制部分， 在预定的UL子帧中分配递送确认信号，并且当UL子帧被配置在FDD小区和TDD小区中时，无论被配置为主小区的小区如何，反馈控制部分反馈传送确认信号 通过使用一个或两个小区的UL子帧，并且当仅在FDD小区中配置UL子帧时，反馈控制部分通过使用FDD小区的UL子帧来反馈传送确认信号。

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：US20160057670A1

公开(公告)日：2016-02-25

申请号：US14872924

申请日：2015-10-01

Applicant: NTT DOCOMO, INC.

Inventor： Hiroyuki Ishii

IPC: H04W36/04 ,  H04W36/22 ,  H04W36/38

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.

Abstract translation: 在蜂窝电信网络中，将数据业务从基站卸载到小节点设备的移动通信系统包括无线基站，多个小节点设备，宏基站到小区， 节点设备（BS2D）通信部分，被配置为通过BS2D通信链路从所述无线电基站接收第一控制平面消息;小节点设备到用户设备（D2UE）通信部分， 通过响应于第一控制平面消息建立的无线D2UE通信链路向用户设备提供平面数据，以及中心小节点设备。 中心小节点设备包括缓冲区段，被配置为通过回程链路从服务器接收用户平面业务数据的回程通信部分，并且被配置为管理多个小节点设备与移动站之间的D2UE连接 在多个小节点设备的下行链路和上行链路中发送缓冲数据，并对D2UE连接进行链路自适应。