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1. 发明授权

US10212713B2 Radio communication system, common reception apparatus and user terminal 有权
公开(公告)号：US10212713B2
公开(公告)日：2019-02-19
申请号：US15108010
申请日：2014-12-26
申请人： NTT DOCOMO, INC.
发明人： Jiyun Shen , Satoshi Suyama , Takahiro Asai , Yukihiko Okumura , Hidekazu Murata
IPC分类号： H04W72/08 , H04L5/00 , H04B7/04 , H04B7/0452 , H04B7/0456 , H04B7/06 , H04W84/00 , H04W16/28 , H04L1/00
摘要： To suppress reduction in system performance for mobile communications (group mobility) in a plurality of terminals existing inside the same moving object, a radio communication system for a plurality of user terminals existing inside a moving object and a radio base station is described. The user terminal receives a signal transmitted from the radio base station, and transmits the signal transmitted from the radio base station to a common reception apparatus disposed inside the moving object. The common reception apparatus detects a signal for each user terminal, based on signals transmitted from the plurality of user terminals, and transmits the detected signal to each user terminal. The user terminal receives the signal for the user terminal detected in the common reception apparatus to demodulate. Thus, for group mobility, it is possible to cancel interference among user terminals to improve the multiplexing effect, while suppressing communication overhead.

2. 发明申请

US20160248485A1 RADIO APPARATUS, RADIO CONTROL APPARATUS AND COMMUNICATION CONTROL METHOD 有权
标题翻译：无线电设备，无线电控制装置和通信控制方法
公开(公告)号：US20160248485A1
公开(公告)日：2016-08-25
申请号：US15028245
申请日：2014-10-02
申请人： NTT DOCOMO, INC.
发明人： Takahiro Kubo , Takahiro Asai , Jiyun Shen , Satoshi Suyama , Yukihiko Okumura
IPC分类号： H04B7/04 , H01Q1/24 , H04B7/06
CPC分类号： H04B7/0413 , H01Q1/246 , H01Q21/28 , H04B7/0617 , H04B7/0634 , H04B10/2575 , H04B10/25758 , H04L27/2607 , H04L27/2634
摘要： To reduce a bandwidth required for an optical transmission path (30) in a base station system including an RAU (21) for performing MIMO transmission using a plurality of antenna elements and a BBU (11), in a communication control method of the present invention, the BBU (11) transmits antenna weight coefficient information indicative of antenna weight coefficients of a plurality of antenna elements (205) and a transmission signal, and the RAU (21) multiplies the transmission signal from the BBU (11) by each of the antenna weight coefficients to generate weighted signals of the plurality of antenna elements (205), and transmits the weighted signals from the plurality of antenna elements (205).
摘要翻译：为了减少包括用于使用多个天线元件和BBU（11）进行MIMO传输的RAU（21）的基站系统中的光传输路径（30）所需的带宽，在本发明的通信控制方法中 BBU（11）发送表示多个天线元件（205）的天线权重系数的天线权重系数信息和发送信号，RAU（21）将来自BBU（11）的发送信号乘以天线权重系数以产生多个天线元件（205）的加权信号，并且从多个天线元件（205）发送加权信号。

3. 发明授权

US08700078B2 Radio station, transmitting station, and frequency band sharing method 有权
标题翻译：无线电台，发射台和频带共享方式
公开(公告)号：US08700078B2
公开(公告)日：2014-04-15
申请号：US13667324
申请日：2012-11-02
申请人： NTT DoCoMo, Inc.
发明人： Hiroki Harada , Hiromasa Fujii , Takahiro Asai , Tomoyuki Ohya
IPC分类号： H04B7/00
CPC分类号： H04W16/14 , H04W52/243 , H04W88/08
摘要： The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system.
摘要翻译：本发明具有以下步骤：第二无线通信系统中的发送站基于从基站广播的第一无线通信系统的负载信息来确定是否可以使用共享频带发送第二无线通信系统信号第一无线通信系统，第二无线通信系统中的发送站利用通过共享频带发送的第二无线通信系统信号来计算在第一无线通信系统中的接收站中产生的预测干扰功率的步骤，以及步骤其中第一无线电通信系统中的基站基于在第二无线电通信系统中从发送站广播的预测干扰功率，增加使用共享频带发送的第一无线电通信系统信号的容许干扰电平。

4. 发明申请

US20190387467A1 USER TERMINAL AND CELL SELECTION METHOD 审中-公开
公开(公告)号：US20190387467A1
公开(公告)日：2019-12-19
申请号：US16487544
申请日：2017-12-18
申请人： NTT DOCOMO, INC.
发明人： Akira Kishida , Yoshifumi Morihiro , Takahiro Asai , Yukihiko Okumura
IPC分类号： H04W48/20 , H04W64/00 , H04W24/10 , H04W36/08 , H04W88/06
摘要： In user terminal 10 of the present invention, connection-cell-selection controlling section 110 measures reception quality of signals respectively transmitted from cells and received by antenna section 108, corrects the reception quality of each of the cells based on a positional relationship between each of the cells and user terminal 10 and based on a moving direction of user terminal 10, and determines a connection cell for user terminal 10 (base station in communication with user terminal 10) based on the corrected reception quality. This configuration lowers a cell switching frequency, while preventing degradation of throughput and the like in a future radio communication system (multilayer cellular radio network).

5. 发明授权

US10484917B2 Handover controller communication apparatus 有权
公开(公告)号：US10484917B2
公开(公告)日：2019-11-19
申请号：US16082778
申请日：2017-02-15
申请人： NTT DOCOMO, INC.
发明人： Yoshifumi Morihiro , Takahiro Asai
IPC分类号： H04W36/00 , H04W36/04 , H04W36/30 , H04W36/38
摘要： A communication apparatus in a wireless communication system in which a plurality of cells with different bands are overlaid and which includes the communication apparatus and a user equipment include: an acquisition unit configured to acquire communication quality of the user equipment in a first cell in which the user equipment resides; a determination unit configured to determine whether to perform the switch to a second cell overlaid with the first cell based on the communication quality of the user equipment; and an instruction unit configured to instruct the user equipment to perform the switch to the second cell when the switch to the second cell overlaid with the first cell is determined.

6. 发明申请

US20190116064A1 RADIO COMMUNICATION SYSTEM AND BASE STATION 审中-公开
公开(公告)号：US20190116064A1
公开(公告)日：2019-04-18
申请号：US16083008
申请日：2017-03-08
申请人： NTT DOCOMO, INC.
发明人： Takahiro Kubo , Takahiro Asai
IPC分类号： H04L25/02 , H04L12/26 , H04B7/0413
摘要： There is provided a radio communication system provided with a first base station, a second base station that communicates with the first base station, and user equipment that communicates with the first base station, the radio communication system including a determiner that determines, based on a predetermined reference value, sharing between signal processing that is to be performed by the first base station and signal processing that is to be performed by the second base station; a first signal processor for the first base station to perform the signal processing in accordance with the sharing determined by the determiner; and a second signal processor for the second base station to perform the signal processing in accordance with the sharing determined by the determiner.

7. 发明申请

US20190098639A1 RADIO COMMUNICATION SYSTEM AND BASE STATION 审中-公开
公开(公告)号：US20190098639A1
公开(公告)日：2019-03-28
申请号：US16082579
申请日：2017-03-08
申请人： NTT DOCOMO, INC.
发明人： Takahiro Kubo , Takahiro Asai
IPC分类号： H04W72/08 , H04B7/0413
摘要： A radio communication system includes a first base station, a second base station, a third base station, and a user equipment, wherein the radio communication system includes a determination unit that determines allocation of signal processing that is commonly performed by the first base station and the second base station and signal processing that is performed by the third base station, based on a predetermined reference value; a first signal processor that performs the signal processing allocated to the first base station in accordance with the allocation determined by the determination unit; a second signal processor that performs the signal processing allocated to the second base station in accordance with the allocation determined by the determination unit; and a third signal processor that performs the signal processing allocated to the third base station in accordance with the allocation determined by the determination unit.

8. 发明授权

US09762298B2 Radio apparatus, radio control apparatus and communication control method 有权
公开(公告)号：US09762298B2
公开(公告)日：2017-09-12
申请号：US15028245
申请日：2014-10-02
申请人： NTT DOCOMO, INC.
发明人： Takahiro Kubo , Takahiro Asai , Jiyun Shen , Satoshi Suyama , Yukihiko Okumura
IPC分类号： H04B7/0413 , H04B7/06 , H04L27/26 , H01Q1/24 , H01Q21/28 , H04B10/2575
CPC分类号： H04B7/0413 , H01Q1/246 , H01Q21/28 , H04B7/0617 , H04B7/0634 , H04B10/2575 , H04B10/25758 , H04L27/2607 , H04L27/2634
摘要： To reduce a bandwidth required for an optical transmission path (30) in a base station system including an RAU (21) for performing MIMO transmission using a plurality of antenna elements and a BBU (11), in a communication control method of the present invention, the BBU (11) transmits antenna weight coefficient information indicative of antenna weight coefficients of a plurality of antenna elements (205) and a transmission signal, and the RAU (21) multiplies the transmission signal from the BBU (11) by each of the antenna weight coefficients to generate weighted signals of the plurality of antenna elements (205), and transmits the weighted signals from the plurality of antenna elements (205).

9. 发明申请

US20160323894A1 RADIO COMMUNICATION SYSTEM, COMMON RECEPTION APPARATUS AND USER TERMINAL 审中-公开
标题翻译：无线电通信系统，通用接口设备和用户终端
公开(公告)号：US20160323894A1
公开(公告)日：2016-11-03
申请号：US15108010
申请日：2014-12-26
申请人： NTT DOCOMO, INC.
发明人： Jiyun Shen , Satoshi Suyama , Takahiro Asai , Yukihiko Okumura , Hidekazu Murata
IPC分类号： H04W72/08 , H04L5/00 , H04B7/04
CPC分类号： H04W72/082 , H04B7/04 , H04B7/0452 , H04B7/0456 , H04B7/0617 , H04B7/0619 , H04L1/0026 , H04L5/0026 , H04L5/006 , H04W16/28 , H04W84/005
摘要： To suppress reduction in system performance for mobile communications (group mobility) in a plurality of terminals existing inside the same moving object, a radio communication system for a plurality of user terminals existing inside a moving object and a radio base station is described. The user terminal receives a signal transmitted from the radio base station, and transmits the signal transmitted from the radio base station to a common reception apparatus disposed inside the moving object. The common reception apparatus detects a signal for each user terminal, based on signals transmitted from the plurality of user terminals, and transmits the detected signal to each user terminal. The user terminal receives the signal for the user terminal detected in the common reception apparatus to demodulate. Thus, for group mobility, it is possible to cancel interference among user terminals to improve the multiplexing effect, while suppressing communication overhead.
摘要翻译：为了抑制存在于同一运动物体内的多个终端中的移动通信（组移动性）的系统性能的降低，描述了存在于移动物体内的多个用户终端的无线通信系统和无线基站。用户终端接收从无线基站发送的信号，并将从无线基站发送的信号发送到设置在移动对象内的公共接收装置。公共接收装置基于从多个用户终端发送的信号来检测每个用户终端的信号，并将检测到的信号发送给每个用户终端。用户终端接收在公共接收装置中检测到的用户终端的信号进行解调。因此，对于组移动性，可以消除用户终端之间的干扰，以提高复用效果，同时抑制通信开销。

10. 发明授权

US11184844B2 User terminal and cell selection method 有权
公开(公告)号：US11184844B2
公开(公告)日：2021-11-23
申请号：US16487544
申请日：2017-12-18
申请人： NTT DOCOMO, INC.
发明人： Akira Kishida , Yoshifumi Morihiro , Takahiro Asai , Yukihiko Okumura
IPC分类号： H04W48/20 , H04W24/10 , H04W36/08 , H04W64/00 , H04W88/06
摘要： In user terminal 10 of the present invention, connection-cell-selection controlling section 110 measures reception quality of signals respectively transmitted from cells and received by antenna section 108, corrects the reception quality of each of the cells based on a positional relationship between each of the cells and user terminal 10 and based on a moving direction of user terminal 10, and determines a connection cell for user terminal 10 (base station in communication with user terminal 10) based on the corrected reception quality. This configuration lowers a cell switching frequency, while preventing degradation of throughput and the like in a future radio communication system (multilayer cellular radio network).

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