公开(公告)号：US20160014781A1

公开(公告)日：2016-01-14

申请号：US14766624

申请日：2014-01-30

Applicant: NTT DOCOMO, INC.

Inventor： Satoshi Nagata ,  Yoshihisa Kishiyama ,  Kazuaki Takeda ,  Hiroyuki Ishii

IPC: H04W72/04

CPC classification number: H04W72/0453 ,  H04W72/0426 ,  H04W72/082

Abstract: In a communication environment where a plurality of operators coexist, in order to minimize interference between the operators and also improve use efficiency of radio resources, a radio base station is disclosed. The radio base station includes an allocation control section that controls allocation to make an UL carrier for uplink transmission and a DL carrier for downlink transmission orthogonal to each other in a frequency direction, and a transmission/reception section that performs transmission or reception of a signal by using either of the UL carrier and the DL carrier for a user terminal in one transmission time interval. The allocation control section controls a carrier adjacent to a carrier used by a different operator to have same transmission direction as the carrier of the different carrier.

Abstract translation: 在多个运营商共存的通信环境中，为了最小化运营商之间的干扰并提高无线电资源的使用效率，公开了一种无线电基站。 无线基站包括：分配控制部，其控制分配以进行上行链路传输的UL载波，以及用于下行链路传输的DL载波在频率方向上彼此正交;发送/接收部，执行信号的发送或接收 通过在一个传输时间间隔内为用户终端使用UL载波和DL载波中的任一个。 分配控制部分控制与不同运营商使用的载波相邻的载波具有与不同载波的载波相同的传输方向。

公开(公告)号：US20150312752A1

公开(公告)日：2015-10-29

申请号：US14424110

申请日：2013-08-19

Applicant: NTT DOCOMO, INC.

Inventor： Tooru Uchino ,  Sadayuki Abeta ,  Hiroyuki Ishii

IPC: H04W8/26 ,  H04W16/30

CPC classification number: H04W76/021 ,  H04W8/26 ,  H04W16/02 ,  H04W16/30 ,  H04W52/244

Abstract: Even when a same C-RNTI is allocated to multiple mobile stations in a phantom cell, a collision between the mobile stations UE to which the same C-RNTI is allocated is avoided. A radio base station PhNB#10 according to the present invention is configured to manage a cell #10 (phantom cell) which is formed by linking multiple small cells and includes an allocation unit 11 configured to allocate a same C-RNTIph to multiple mobile stations UE#1/UE#3 which are separated by at least a predetermined distance in the cell #10.

Abstract translation: 即使在幻象小区中分配了多个移动台，也分配了相同的C-RNTI，因此避免了分配了相同C-RNTI的移动台UE之间的冲突。 根据本发明的无线基站PhNB＃10被配置为管理通过链接多个小小区而形成的小区＃10（幻像小区），并且包括被配置为向多个移动站分配相同的C-RNTIph的分配单元11 UE＃1 / UE＃3，其在小区＃10中被隔开至少预定的距离。

公开(公告)号：US20150237582A1

公开(公告)日：2015-08-20

申请号：US14701876

申请日：2015-05-01

Applicant: NTT DOCOMO, INC.

Inventor： Hiroyuki Ishii

IPC: H04W52/02 ,  H04W88/06 ,  H04W76/04

CPC classification number: H04W52/0241 ,  H04L5/001 ,  H04L5/0091 ,  H04L5/0098 ,  H04W24/10 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0254 ,  H04W72/00 ,  H04W72/0406 ,  H04W76/28 ,  H04W88/06 ,  Y02D70/1244 ,  Y02D70/1246 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/146 ,  Y02D70/24

Abstract: A mobile station UE in accordance with an embodiment of the present invention is a mobile station for communicating with a radio base station using two or more carriers. The two or more carriers include a carrier in a non-discontinuous reception state and a carrier in a discontinuous reception state. The mobile station includes a first communicating unit configured to perform communications on the carrier in the non-discontinuous reception state and a second communicating unit configured to perform communications on the carrier in the discontinuous reception state. The first communicating unit treats intervals before and after an on-duration on the carrier in the discontinuous reception state as measurement gaps.

Abstract translation: 根据本发明的实施例的移动台UE是用于使用两个或更多个载波与无线电基站通信的移动站。 两个或多个载波包括非间歇接收状态的载波和不连续接收状态的载波。 移动站包括：第一通信单元，被配置为在非间歇接收状态下在载波上执行通信;第二通信单元，被配置为在不连续接收状态下对载波进行通信。 第一通信单元将不连续接收状态下的载波上的接通时间之前和之后的间隔视为测量间隙。

公开(公告)号：US20150172963A1

公开(公告)日：2015-06-18

申请号：US14406757

申请日：2013-05-14

Applicant: NTT DOCOMO, INC.

Inventor： Jinho Kim ,  Hiroto Yasuda ,  Yasufumi Morioka ,  Hideaki Takahashi ,  Junichiro Hagiwara ,  Hiroyuki Ishii

IPC: H04W36/00

CPC classification number: H04W36/0027 ,  H04W36/0088 ,  H04W76/12

Abstract: A radio communication system has a user equipment, a first base station, a second base station, and a gateway device. The first base station is capable of executing radio resource control of the user equipment, whereas the second base station does not execute radio resource control of the user equipment. The first base station, based on a measurement report message, determines whether a user-plane path is to be established between the first base station and the second base station. In a case in which it is determined that a user-plane path is to be established, the first base station establishes a user-plane path between the first base station and the second base station. Also, the first base station controls the user equipment to establish a user-plane path between the user equipment and the second base station.

Abstract translation: 无线电通信系统具有用户设备，第一基站，第二基站和网关设备。 第一基站能够执行用户设备的无线电资源控制，而第二基站不执行用户设备的无线电资源控制。 第一基站，基于测量报告消息，确定在第一基站和第二基站之间是否建立用户平面路径。 在确定要建立用户平面路径的情况下，第一基站在第一基站和第二基站之间建立用户平面路径。 此外，第一基站控制用户设备在用户设备和第二基站之间建立用户平面路径。

公开(公告)号：US20150017993A1

公开(公告)日：2015-01-15

申请号：US14380600

申请日：2012-11-29

Applicant: NTT DOCOMO, INC.

Inventor： Hiroyuki Ishii

IPC: H04W36/04 ,  H04W36/00 ,  H04W36/22

CPC classification number: H04W36/04 ,  H04W16/26 ,  H04W28/08 ,  H04W36/0011 ,  H04W36/22 ,  H04W84/047

Abstract: In a telecommunications network, a system to offload data traffic from base stations to small node devices includes a small node device. The small node device includes a macro-base-station-to-small-node-device (BS2D) communication section in communication with a source base station through a first link, and a small-node-device-to-user-equipment (D2UE) communication section in wireless communication with a mobile station through a fourth link. A control unit in the source base station determines a configuration of the fourth link, a macro-base-station-to-user-equipment (BS2UE) communication section is in wireless communication with the mobile station and the source base station through a second link, and a macro-base-station-to-macro-base-station (BS2BS) communication section is in communication with a target radio base station and the source base station through a third link, and a backhaul communication section is in communication with a server.

Abstract translation: 在电信网络中，将数据业务从基站卸载到小节点设备的系统包括小节点设备。 小节点设备包括通过第一链路与源基站通信的宏基站到小节点设备（BS2D）通信部分和小节点设备到用户设备（ D2UE）通信部分，其通过第四链路与移动台进行无线通信。 源基站中的控制单元确定第四链路的配置，宏基站到用户设备（BS2UE）通信部分通过第二链路与移动站和源基站进行无线通信 ，并且宏基站到宏基站（BS2BS）通信部分通过第三链路与目标无线电基站和源基站通信，并且回程通信部分与 服务器。

公开(公告)号：US20140369223A1

公开(公告)日：2014-12-18

申请号：US14374966

申请日：2013-01-30

Applicant: NTT DOCOMO, INC.

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

IPC: H04L5/00 ,  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：US20180199393A1

公开(公告)日：2018-07-12

申请号：US15915986

申请日：2018-03-08

Applicant: NTT DOCOMO, INC.

Inventor： Jinho Kim ,  Hiroto Yasuda ,  Yasufumi Morioka ,  Hideaki Takahashi ,  Junichiro Hagiwara ,  Hiroyuki Ishii

IPC: H04W76/15 ,  H04W74/00 ,  H04W76/12 ,  H04W76/10 ,  H04W88/16

CPC classification number: H04W76/15 ,  H04W74/002 ,  H04W76/10 ,  H04W76/12 ,  H04W88/16

Abstract: A radio communication system is disclosed that includes at least one user equipment and multiple base stations including a first base station configured to execute radio resource control of the user equipment through a control path and a second base station configured not to execute radio resource control of the user equipment. The system includes multiple gateways, including a first gateway connected with the first base station and a second gateway connected with the second base station, and a switching station that controls the establishment of user paths among nodes.

公开(公告)号：US09942818B2

公开(公告)日：2018-04-10

申请号：US15400594

申请日：2017-01-06

Applicant: NTT DOCOMO, INC.

Inventor： Hiroyuki Ishii

IPC: H04B1/00 ,  H04W36/22 ,  H04W28/02 ,  H04W76/02

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.

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：US20170339652A1

公开(公告)日：2017-11-23

申请号：US15661244

申请日：2017-07-27

Applicant: NTT DOCOMO, INC.

Inventor： Shimpei Yasukawa ,  Satoshi Nagata ,  Yoshihisa Kishiyama ,  Hiroyuki Ishii

IPC: H04W56/00 ,  H04W74/08

Abstract: The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.