公开(公告)号：US11133880B2

公开(公告)日：2021-09-28

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: H04W40/00 ,  H04B17/391 ,  H04B17/318 ,  H04W64/00 ,  H04W16/18

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：US09325368B2

公开(公告)日：2016-04-26

申请号：US13758419

申请日：2013-02-04

Applicant: Hitachi, Ltd.

Inventor： Yasutaka Serizawa ,  Takashi Yano ,  Masayuki Miyazaki ,  Kenichi Mizugaki

IPC: H04B1/00 ,  H04B1/713 ,  H04B7/26

CPC classification number: H04B1/713 ,  H04B7/2656

Abstract: A period is defined to execute the sequences (processes) of communication data acquisition, measuring communication quality, communication quality data acquisition, and channel change. Processing is controlled to execute each process within a time limit set for each process and execute all processes in one cycle. This avoids that a delayed sequence influences and delays other sequences and can suppress delays. If processing fails to finish a sequence, it will resume the same sequence in the next cycle. For communication stations sharing timeslots, there are provided offset periods differing in length before the start of carrier sense in the timeslots for these stations. Consequently, even under a condition in which packet collision may occur, the collision of packets can be avoided by detecting a packet sent to another station by carrier sense. Moreover, by controlling sending priority of packets in the send queue of the gateway, sending delay can be avoided.

Abstract translation: 定义一个时期来执行通信数据采集，测量通信质量，通信质量数据采集和信道变化的序列（过程）。 控制处理以在为每个进程设置的时间限制内执行每个进程，并在一个周期内执行所有进程。 这避免延迟的序列影响和延迟其他序列并且可以抑制延迟。 如果处理无法完成序列，它将在下一个周期恢复相同的序列。 对于共享时隙的通信站，在这些站的时隙中提供在载波侦听开始之前长度不同的偏移周期。 因此，即使在可能发生分组冲突的情况下，也可以通过检测通过载波侦听发送到另一个站的分组来避免分组的冲突。 此外，通过控制网关发送队列中的报文发送优先级，可以避免发送延迟。

公开(公告)号：US09137079B2

公开(公告)日：2015-09-15

申请号：US13740577

申请日：2013-01-14

Applicant: Hitachi, Ltd.

Inventor： Satoshi Tamaki ,  Takashi Yano ,  Koki Uwano

IPC: H04L27/28 ,  H04L27/26 ,  H04L25/03

CPC classification number: H04L27/2626 ,  H04L25/03828 ,  H04L27/2647 ,  H04L27/2665

Abstract: A radio communication system using an orthogonal frequency division multiplexing system, including: a baseband unit; and one or plural remote radio units coupled with the baseband unit through an interface; wherein the baseband unit includes a first sample frequency conversion part that performs a first sample frequency conversion processing that down-samples a transmitting signal transmitted through the interface, wherein the remote radio unit includes a second sample frequency conversion part that performs a second sample frequency conversion processing that up-samples a signal received through the interface, and wherein the baseband unit further includes an inverse fast fourier transform part that generates the transmitting signal by an inverse fast fourier transform, and a transmitter characteristic compensation part that conducts frequency characteristic compensation of the first sample frequency conversion processing and the second sample frequency conversion processing for a signal that has not been subjected to the inverse fast fourier transform.

Abstract translation: 一种使用正交频分复用系统的无线电通信系统，包括：基带单元; 以及通过接口与基带单元耦合的一个或多个远程无线电单元; 其中，所述基带单元包括：第一采样频率变换部，其执行对通过所述接口发送的发送信号进行下采样的第一采样频率变换处理，其中，所述远程无线单元包括执行第二采样频率变换的第二采样频率变换部 对通过接口接收到的信号进行加样的处理，其中，所述基带部还包括通过反向快速傅里叶变换生成发送信号的逆快速傅里叶变换部，以及发送特性补偿部， 第一采样频率转换处理和对未进行逆快速傅立叶变换的信号的第二采样频率变换处理。

公开(公告)号：US20140105323A1

公开(公告)日：2014-04-17

申请号：US14133869

申请日：2013-12-19

Applicant: Hitachi, Ltd.

Inventor： Takashi Yano ,  Satoshi Tamaki ,  Seishi Hanaoka ,  Takeshi Kato

IPC: H04B7/06

CPC classification number: H04B7/0617 ,  H04B7/0615 ,  H04B7/0669 ,  H04B7/0848 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/005 ,  H04L1/0061 ,  H04L1/0066 ,  H04L1/06 ,  H04L1/16 ,  H04L1/1845 ,  H04L2001/0096 ,  H04W16/28

Abstract: This invention provides a mobile communication system which expanded the operation limitation of the heretofore adopted mobile communication systems and improved the spectrum efficiency greatly. A data transmission method for use in the mobile communication system of the present invention includes means for channel pluralizing by which to expand the Shannon limit and means for interference reduction by which to expand the interference limit. More specifically, a transmitting module comprises M units of modulators and L units of transmitting antennas, generates L units of signals by multiplying M units of modulated signals by a complex matrix consisting of M×L units of elements, and transmits the L units of signals from the L units of transmitting antennas.

Abstract translation: 本发明提供一种移动通信系统，其扩展了迄今采用的移动通信系统的操作限制，并大大提高了频谱效率。 在本发明的移动通信系统中使用的数据传输方法包括用于扩展香农限制的信道多路化装置和用于扩大干扰限制的干扰减少装置。 更具体地，发送模块包括M个调制器和L个发送天线单元，通过将M个调制信号乘以由M×L个元素组成的复数矩阵，生成L个单位的信号，并发送L个信号单元 来自发射天线的L个单位。

公开(公告)号：US20130235905A1

公开(公告)日：2013-09-12

申请号：US13758419

申请日：2013-02-04

Applicant: HITACHI, LTD.

Inventor： YASUTAKA SERIZAWA ,  Takashi Yano ,  Masayuki Miyazaki ,  Kenichi Mizugaki

IPC: H04B1/713

CPC classification number: H04B1/713 ,  H04B7/2656

Abstract: A period is defined to execute the sequences (processes) of communication data acquisition, measuring communication quality, communication quality data acquisition, and channel change. Processing is controlled to execute each process within a time limit set for each process and execute all processes in one cycle. This avoids that a delayed sequence influences and delays other sequences and can suppress delays. If processing fails to finish a sequence, it will resume the same sequence in the next cycle. For communication stations sharing timeslots, there are provided offset periods differing in length before the start of carrier sense in the timeslots for these stations. Consequently, even under a condition in which packet collision may occur, the collision of packets can be avoided by detecting a packet sent to another station by carrier sense. Moreover, by controlling sending priority of packets in the send queue of the gateway, sending delay can be avoided.

Abstract translation: 定义一个时期来执行通信数据采集，测量通信质量，通信质量数据采集和信道变化的序列（过程）。 控制处理以在为每个进程设置的时间限制内执行每个进程，并在一个周期内执行所有进程。 这避免延迟的序列影响和延迟其他序列并且可以抑制延迟。 如果处理无法完成序列，它将在下一个周期恢复相同的序列。 对于共享时隙的通信站，在这些站的时隙中提供在载波侦听开始之前长度不同的偏移周期。 因此，即使在可能发生分组冲突的情况下，也可以通过检测通过载波侦听发送到另一个站的分组来避免分组的冲突。 此外，通过控制网关发送队列中的报文发送优先级，可以避免发送延迟。

公开(公告)号：US09042348B2

公开(公告)日：2015-05-26

申请号：US14133869

申请日：2013-12-19

Applicant: Hitachi, Ltd.

Inventor： Takashi Yano ,  Satoshi Tamaki ,  Seishi Hanaoka ,  Takeshi Kato

IPC: H04W4/00 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L1/18 ,  H04W16/28

CPC classification number: H04B7/0617 ,  H04B7/0615 ,  H04B7/0669 ,  H04B7/0848 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/005 ,  H04L1/0061 ,  H04L1/0066 ,  H04L1/06 ,  H04L1/16 ,  H04L1/1845 ,  H04L2001/0096 ,  H04W16/28

Abstract: This invention provides a mobile communication system which expanded the operation limitation of the heretofore adopted mobile communication systems and improved the spectrum efficiency greatly. A data transmission method for use in the mobile communication system of the present invention includes means for channel pluralizing by which to expand the Shannon limit and means for interference reduction by which to expand the interference limit. More specifically, a transmitting module comprises M units of modulators and L units of transmitting antennas, generates L units of signals by multiplying M units of modulated signals by a complex matrix consisting of M×L units of elements, and transmits the L units of signals from the L units of transmitting antennas.

Abstract translation: 本发明提供一种移动通信系统，其扩展了迄今采用的移动通信系统的操作限制，并大大提高了频谱效率。 在本发明的移动通信系统中使用的数据传输方法包括用于扩展香农限制的信道多路化装置和用于扩大干扰限制的干扰减少装置。 更具体地，发送模块包括M个调制器和L个发送天线单元，通过将M个调制信号乘以由M×L个元素组成的复数矩阵，生成L个单位的信号，并发送L个信号单元 来自发射天线的L个单位。