公开(公告)号：US20200235835A1

公开(公告)日：2020-07-23

申请号：US16744891

申请日：2020-01-16

Applicant: HITACHI, LTD.

Inventor： Hiroki YAMADA ,  Yuichi IGARASHI ,  Kenzaburo FUJISHIMA ,  Takashi YANO ,  Masami OONISHI

IPC: H04B17/391 ,  H04W16/18 ,  H04W64/00 ,  H04B17/318

Abstract: A computer system, which estimates a radio wave propagation characteristic in a space where a wireless communication system using structure data and system data is constructed, includes a computer having a processor and a storage apparatus and holds feature parameter information, which stores an entry that associates a parameter included in structure data, that is, a feature parameter which greatly contributes to an estimation result of the radio wave propagation characteristic in the space with a type of the space. When receiving a request for estimation of a radio wave propagation characteristic in a target space, the processor retrieves an entry associated with a type of the target space from the feature parameter information, and presents an interface to input a value of the feature parameter included in the retrieved entry as estimation structure data and an interface to input estimation system data.

公开(公告)号：US20160057674A1

公开(公告)日：2016-02-25

申请号：US14235464

申请日：2013-03-15

Applicant: HITACHI, LTD.

Inventor： Eriko TAKEDA ,  Takashi ISHIKAWA ,  Satoshi TAMAKI ,  Go ONO ,  Katsuhiko TSUNEHARA ,  Kenzaburo FUJISHIMA

IPC: H04W36/16 ,  H04W36/08

CPC classification number: H04W36/16 ,  H04W36/08 ,  H04W48/20

Abstract: The invention is intended to, even in a situation where there are many candidate wireless base stations (WBSs) to which a mobile terminal (MT) may connect, get information of communication conditions between the MT and each of those WBSs and determine an WBS to which the MT should connect in a shorter time. A coverage area of the first WBS is overlapped partially at least by a coverage area of the second WBS. The MT transmits a signal for connection using a predetermined frequency. Upon receiving the signal for connection, the second WBSs each notify the WBS communication manager of their reception results of the signal for connection. The WBS communication manager selects a second WBS to communicate with the MT based on the reception results and notifies the selected second WBS to transmit a response signal to the signal for connection to the MT.

Abstract translation: 本发明即使在移动终端（MT）可以连接有许多候选无线基站（WBS）的情况下，获得MT与这些WBS中的每一个之间的通信条件的信息，并且确定WBS到 MT应该在更短的时间内连接。 第一WBS的覆盖区域至少部分地被第二WBS的覆盖区域重叠。 MT使用预定频率发送用于连接的信号。 在接收到用于连接的信号时，第二WBS通知WBS通信管理器其用于连接的信号的接收结果。 WBS通信管理器基于接收结果选择第二WBS与MT进行通信，并通知所选择的第二WBS向与MT连接的信号发送响应信号。

公开(公告)号：US20160198458A1

公开(公告)日：2016-07-07

申请号：US15072781

申请日：2016-03-17

Applicant: Hitachi, Ltd.

Inventor： Go ONO ,  Kenzaburo FUJISHIMA ,  May TAKADA ,  Koki UWANO

IPC: H04W72/04 ,  H04W28/02 ,  H04W40/06 ,  H04B7/04 ,  H04W72/12 ,  H04L5/00

CPC classification number: H04W72/0426 ,  H04B7/024 ,  H04B7/0413 ,  H04L5/0035 ,  H04L5/0055 ,  H04L5/0057 ,  H04W28/0236 ,  H04W40/06 ,  H04W72/1236 ,  H04W88/02 ,  H04W88/08 ,  H04W88/16

Abstract: It is provided a wireless communication system comprising base stations that transmit data to a terminal with cooperation by the base stations. The terminal communicates with the base stations. The terminal periodically transmits, to one of the base stations, information necessary for data transmission from a single base station out of the base stations. Each of the base stations determines whether the terminal needs data transmission through a cooperation among the base stations, and transmits a cooperation information transmission instruction to the terminal, which includes information necessary to execute the data transmission in order to cooperate among the base stations in the case where it is determined that the terminal needs the data transmission through the cooperation among the base stations. The terminal transmits the cooperation information to the base stations in a case of receiving the cooperation information transmission instruction.

Abstract translation: 提供了一种无线通信系统，其包括基站，其通过基站的协作向终端发送数据。 终端与基站进行通信。 终端周期性地向基站之一发送从基站中的单个基站进行数据传输所需的信息。 每个基站确定终端是否需要通过基站之间的协作进行数据传输，并且向终端发送协作信息传输指令，其包括执行数据传输所必需的信息，以便在基站中进行协作 确定终端需要通过基站之间的协作进行数据传输的情况。 在接收合作信息发送指示的情况下，终端向基站发送合作信息。

公开(公告)号：US20130272274A1

公开(公告)日：2013-10-17

申请号：US13779075

申请日：2013-02-27

Applicant: HITACHI, LTD.

Inventor： Hitoshi ISHIDA ,  Kenzaburo FUJISHIMA ,  Yunjian JIA

IPC: H04W72/08

CPC classification number: H04W72/082 ,  H04L5/0035 ,  H04W72/0426 ,  H04W72/08 ,  Y02D70/1262 ,  Y02D70/1264

Abstract: In an environment in which a macro base station and a low transmission power base station exist, the ratio of the interference reduction time period of the macro base station is optimized, and the throughput of the low transmission power base station is improved, while minimizing a reduction in throughput. The macro base station causes a high interference to other base stations and one or a plurality of low power nodes (LPN) subjected to interference from the macro base station. The macro base station sets first and second data transmission time periods and then determines the ratio of the second time period and the pattern of the first time period and the second time period based on communication quality in the first time period and communication quality in the second time period of the macro base station and the LPN.

Abstract translation: 在存在宏基站和低发射功率基站的环境中，优化了宏基站的干扰减少时间周期的比例，提高了低发射功率基站的吞吐量，同时使 吞吐量降低 宏基站对其他基站和受到来自宏基站的干扰的一个或多个低功率节点（LPN）造成高干扰。 宏基站设置第一和第二数据传输时间段，然后基于第一时间段中的通信质量和第二时间段中的通信质量来确定第二时间段和第一时间段和第二时间段的模式的比率 宏基站和LPN的时间段。

公开(公告)号：US20160323421A1

公开(公告)日：2016-11-03

申请号：US15097497

申请日：2016-04-13

Applicant: HITACHI, LTD.

Inventor： Yoshiki SAKURAI ,  Takashi ISOBE ,  Kenzaburo FUJISHIMA

IPC: H04L29/06 ,  H04L12/26 ,  H04L5/00 ,  H04W24/08

CPC classification number: H04L69/163 ,  H04L43/0841 ,  H04L43/0888 ,  H04W24/02 ,  H04W24/08

Abstract: When a TCP packet communication acceleration technique is applied to a wireless communication network, an acceleration effect is determined according to various pieces of information in real time, and acceleration control is dynamically performed to efficiently accelerate the communication by the use of the TCP of a wireless terminal present in the wireless communication network. A wireless communication system including at least one wireless terminal and at least one base station that communicates with the wireless terminal further includes an information collection server that collects various pieces of information from the base station and the wireless terminal. The base station includes a packet acceleration unit that accelerates a TCP packet communication, and the information collection server determines whether to accelerate the base station from the various pieces of information, or not, and controls the acceleration of the base station on the basis of its determination result.

Abstract translation: 当将TCP分组通信加速技术应用于无线通信网络时，根据各种信息实时地确定加速度效果，动态地进行加速控制，通过使用无线TCP的TCP来有效地加速通信 终端存在于无线通信网络中。 包括至少一个无线终端和至少一个与无线终端通信的基站的无线通信系统还包括从基站和无线终端收集各种信息的信息收集服务器。 基站包括加速TCP分组通信的分组加速单元，并且信息收集服务器判断是否从各种信息加速基站，并且基于它的控制来控制基站的加速度 确定结果。

公开(公告)号：US20150036624A1

公开(公告)日：2015-02-05

申请号：US14450514

申请日：2014-08-04

Applicant: Hitachi, Ltd.

Inventor： Kenzaburo FUJISHIMA ,  Masanori TAIRA ,  Shigenori HAYASE

IPC: H04W72/04 ,  H04L29/08

CPC classification number: H04W72/044

Abstract: Provided is a base station apparatus including an upper layer processor and a lower layer processor. The upper layer processor: holds allocation rights information representing that a cell has a right to allocate a part of a wireless resource owned by the cell to a terminal belonging to the cell, and does not have a right to allocate a remaining part of the wireless resource; allocates the part of the wireless resource which the cell has the right to allocate out of the wireless resource owned by the cell to the terminal; and instructs the lower layer processor to carry out wireless signal processing for the communication to/from the terminal. The lower layer processor: carries out, in accordance with the instruction to carry out the wireless signal processing, the wireless signal processing for the communication to/from the terminal; and notifies the upper layer processor of a result thereof.

Abstract translation: 提供了一种包括上层处理器和下层处理器的基站装置。 上层处理器：保持分配权限信息，表示小区有权将小区拥有的无线资源的一部分分配给属于小区的终端，并且没有权利分配无线的剩余部分 资源; 将小区有权从无线资源分配出的无线资源的一部分分配给终端; 并指示下层处理器对来自终端的通信进行无线信号处理。 下层处理器：按照执行无线信号处理的指令，进行到终端通信的无线信号处理; 并向上层处理器通知其结果。

公开(公告)号：US20140226619A1

公开(公告)日：2014-08-14

申请号：US14258564

申请日：2014-04-22

Applicant: Hitachi, Ltd.

Inventor： Mikio KUWAHARA ,  Kenzaburo FUJISHIMA ,  Masanori TAIRA

IPC: H04W72/12 ,  H04L5/00

CPC classification number: H04W72/1284 ,  H04L5/0005 ,  H04W52/0216 ,  H04W72/1231 ,  Y02D70/00

Abstract: To reduce power consumption of a mobile station, this invention provides a wireless communication method for communicating between a base station and a plurality of terminals using a plurality of channels, the channels being slots obtained by dividing frequency-divided carriers by time, in which the base station allocates a set of the channels which is composed of a plurality of neighboring carriers and/or a plurality of successive slots for the each terminal, and the base station allocates at least one of the channels included in the channel sets for packet transmission the terminals.

Abstract translation: 为了降低移动台的功率消耗，本发明提供了一种用于使用多个信道在基站与多个终端之间通信的无线通信方法，所述信道是通过按时间划分分频载波而获得的时隙，其中 基站为每个终端分配由多个相邻载波和/或多个连续时隙组成的信道集合，并且基站分配包括在信道集中的信道中的至少一个用于分组传输 终端。

公开(公告)号：US20140201754A1

公开(公告)日：2014-07-17

申请号：US14155779

申请日：2014-01-15

Applicant: Hitachi, Ltd.

Inventor： Shigenori HAYASE ,  Kenzaburo FUJISHIMA ,  Hirotake ISHII ,  Masanori TAIRA

IPC: G06F9/50

CPC classification number: H04L69/323 ,  H04B7/0413 ,  H04L1/00 ,  H04L1/0025 ,  H04L1/1816 ,  H04L67/1002 ,  H04L69/321 ,  Y02D70/1262 ,  Y02D70/146 ,  Y02D70/444

Abstract: To prevent the switching time influences power saving performance and packet loss prevention performance, it is provided a wireless communication base station for communicating with a terminal, comprising: a plurality of baseband signal processing units for performing baseband signal processing; a baseband allocation unit for allocating the baseband signal processing to the plurality of baseband signal processing units; and a linear processing unit for composing signals processed by the plurality of baseband signal processing units. The baseband allocation unit selects, for each data block, a baseband signal processing unit to which the baseband signal processing for the each data block is to be allocated out of the plurality of baseband signal processing units. Each of the plurality of baseband signal processing units performs the allocated baseband signal processing. The linear processing unit composes, by means of linear calculation, the signals processed by the plurality of baseband signal processing units.

Abstract translation: 为了防止切换时间影响节电性能和防丢包性能，提供了一种用于与终端通信的无线通信基站，包括：多个基带信号处理单元，用于执行基带信号处理; 基带分配单元，用于将所述基带信号处理分配给所述多个基带信号处理单元; 以及用于组合由所述多个基带信号处理单元处理的信号的线性处理单元。 基带分配单元对于每个数据块选择要从多个基带信号处理单元中分配每个数据块的基带信号处理的基带信号处理单元。 多个基带信号处理单元中的每一个执行所分配的基带信号处理。 线性处理单元通过线性计算构成由多个基带信号处理单元处理的信号。