公开(公告)号：US20220216930A1

公开(公告)日：2022-07-07

申请号：US17600563

申请日：2020-03-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shoko SHINOHARA ,  Toshiro NAKAHIRA ,  Yasuhiko INOUE ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04B17/318 ,  H04W24/10 ,  H04B17/391

Abstract: A wireless communication characteristic evaluation method for calculating a wireless communication characteristic of a wireless communication system in which a plurality of wireless communication terminals perform communication by transmitting or exchanging signals includes: an RSSI measurement step of measuring an RSSI measurement used for calculation of the wireless communication characteristic; and a calculation step of calculating the wireless communication characteristic based on the RSSI measurement and correction data of the RSSI measurement according to specifications of the wireless communication terminals or a correction calculation model.

公开(公告)号：US20220150715A1

公开(公告)日：2022-05-12

申请号：US17440314

申请日：2020-03-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04W16/20 ,  H04B17/391 ,  H04B17/27 ,  H04W84/12

Abstract: This disclosure provides a method for calculating the installation number and installation positions of wireless base stations in accordance with the positions of wireless terminal stations within an installation area. First, when a predetermined number of wireless base stations are temporarily installed within the installation area, a wireless base station accommodating each wireless terminal station in a communication area is determined and the number of wireless base stations accommodating each wireless terminal station is calculated as a “number of conflicts”. Next, wireless base stations successively accommodating starting with an un-accommodated wireless terminal station of a small number of conflicts are successively selected as objects of installation. Then, the installation number and installation positions of the wireless base stations are calculated, with the temporarily installed wireless base stations other than the wireless base stations serving as the objects of installation being excluded.

公开(公告)号：US20210258047A1

公开(公告)日：2021-08-19

申请号：US17306084

申请日：2021-05-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Yusuke ASAI ,  Riichi KUDO ,  Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Takeo ICHIKAWA

IPC: H04B7/0452 ,  H04J11/00 ,  H04L5/00 ,  H04L27/26 ,  H04W28/16 ,  H04B7/024 ,  H04B7/06 ,  H04B7/0456 ,  H04W88/08

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

公开(公告)号：US20210037448A1

公开(公告)日：2021-02-04

申请号：US16969085

申请日：2019-02-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Tomoki MURAKAMI ,  Koichi ISHIHARA ,  Mamoru AKIMOTO ,  Takafumi HAYASHI

IPC: H04W48/02 ,  H04W48/16 ,  H04W88/10 ,  H04W88/06

Abstract: [Problem] In a terminal station and a base station, in which a plurality of wireless communication units supporting different communication performances are mounted, it is possible to select and switch wireless communication unit which responds to a congested condition of wireless communication and a wireless communication quality, and further improves a wireless resource usage efficiency.
[Solution] A wireless communication units individually supporting a plurality of communication performances and selecting a wireless communication unit with respect to a terminal station that has made a connection request according to a communication performance of the terminal station, wherein the base station includes a control unit that is configured to hold, for each of the wireless communication units, terminal station connection permission information indicating a permission condition as to whether permission of the connection request of the terminal station be granted according to the communication performance, to collate the communication performance of the terminal station with the terminal station connection permission information of the wireless communication unit to which the connection request was made, to establish a wireless connection with the terminal station in a case where the communication performance of the terminal station matches the permission condition, and, in a case where the communication performance does not match the permission condition, to direct the terminal station to another wireless communication unit whose permission condition matches the communication performance of the terminal station.

公开(公告)号：US20190081666A1

公开(公告)日：2019-03-14

申请号：US16185859

申请日：2018-11-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Yusuke ASAI ,  Riichi KUDO ,  Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Takeo ICHIKAWA

IPC: H04B7/0452 ,  H04W28/16 ,  H04L5/00 ,  H04B7/06 ,  H04B7/0456 ,  H04B7/024 ,  H04L27/26 ,  H04J11/00 ,  H04W88/08

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

公开(公告)号：US20180054810A1

公开(公告)日：2018-02-22

申请号：US15553678

申请日：2016-03-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shoko SHINOHARA ,  Yasuhiko INOUE ,  Yasushi TAKATORI ,  Koichi ISHIHARA ,  Yusuke ASAI ,  Masato MIZOGUCHI

IPC: H04W72/04

Abstract: In a wireless communication system in which an AP and a plurality of STAs are connected to each other and the AP simultaneously transmits a wireless frame destined for each STA with FDMA, in which the AP includes a control frame transmission unit that generates a control frame having information on a frequency resource allocated to the each STA and transmits the control frame on a primary channel being used in a shared manner by the each STA and a wireless frame transmission unit that simultaneously transmits the wireless frame destined for the each STA on the frequency resource allocated to the each STA, and in which the STA includes a frequency resource selection reception unit that receives the control frame on the primary channel and receives a wireless frame destined for the STA itself on a frequency resource notified by the control frame.

公开(公告)号：US20170070296A1

公开(公告)日：2017-03-09

申请号：US15122582

申请日：2015-03-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Seiji OKAMOTO ,  Koichi ISHIHARA ,  Etsushi YAMAZAKI ,  Mitsuteru YOSHIDA ,  Tomoyoshi KATAOKA ,  Kazushige YONENAGA ,  Yoshiaki KISAKA ,  Masanori NAKAMURA ,  Masahito TOMIZAWA

IPC: H04B10/516 ,  H04B10/508

CPC classification number: H04B10/516 ,  H04B10/0775 ,  H04B10/2513 ,  H04B10/2557 ,  H04B10/508 ,  H04L27/3455 ,  H04L27/3483 ,  H04L27/366

Abstract: An optical signal transmission apparatus includes a modulation unit which modulates a transmission signal, a training signal sequence generation unit which generates a plurality of signal sequences having power concentrated in a plurality of different frequency bands, at least one of an amplitude and a phase of the plurality of signal sequences being modulated, as a training signal sequence, a signal multiplexing unit which appends the training signal sequence to the transmission signal, and an electro-optical conversion unit which converts a signal sequence obtained by appending the training signal sequence to the transmission signal into an optical signal and transmits the optical signal.

Abstract translation: 光信号传输装置包括：调制单元，其对发送信号进行调制;训练信号序列生成单元，生成具有集中在多个不同频带的功率的多个信号序列，所述训练信号序列生成单元的振幅和相位中的至少一个 多个信号序列作为训练信号序列被调制为将训练信号序列附加到传输信号的信号复用单元，以及电光转换单元，其将通过将训练信号序列附加到传输获得的信号序列 信号转换为光信号并发送光信号。

公开(公告)号：US20230292140A1

公开(公告)日：2023-09-14

申请号：US18005993

申请日：2020-08-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Motoharu SASAKI ,  Koichi ISHIHARA ,  Takatsune MORIYAMA ,  Yasushi TAKATORI

IPC: H04W16/18 ,  H04B17/318

CPC classification number: H04W16/18 ,  H04B17/328

Abstract: A determination method of determining an installation position of a movable base station and a connection destination base station, executed by an information processing device including a memory and a processor, includes: determining a mesh in which the movable base station can be installed, and a base station to which the movable base station can be connected in the mesh, based on a reception strength of a radio signal from each of one or more base stations in each of one or more meshes.

公开(公告)号：US20230262476A1

公开(公告)日：2023-08-17

申请号：US18003239

申请日：2020-08-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Motoharu SASAKI ,  Koichi ISHIHARA ,  Takatsune MORIYAMA ,  Yasushi TAKATORI

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

CPC classification number: H04W16/18 ,  H04B17/318 ,  H04B17/3913

Abstract: A radio signal strength information calculation method performed by a control apparatus includes: a generation step of calculating radio information regarding each of a plurality of meshes into which an area where base stations are placed is divided and generating mesh radio information; and a calculation step of placing a virtual base station at a position to where any of the base stations would be moved in the area, and calculating radio signal strength information between a plurality of base stations including the base stations and the virtual base station based on the mesh radio information.

公开(公告)号：US20230113366A1

公开(公告)日：2023-04-13

申请号：US17796138

申请日：2020-01-28

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Hirantha ABEYSEKERA ,  Toshiro NAKAHIRA ,  Shoko SHINOHARA ,  Koichi ISHIHARA ,  Yasushi TAKATORI

IPC: H04W36/24 ,  H04W36/08

Abstract: In a wireless communication system including a plurality of base stations to which terminal stations are connectable, and a base station control device which controls each of the base stations, the base station control device includes an information collection unit configured to collect wireless environment information indicating wireless environments around the base stations and the terminal stations from each of the base stations, and a policy calculation unit configured to calculate policy for connecting the base stations and the terminal stations based on the wireless environment information collected by the information collection unit, each of the base stations includes a reception unit configured to receive the policy calculated by the policy calculation unit, a transition destination calculation unit configured to calculate a transition destination to which a terminal station left unaccommodated is to be connected based on the policy received by the reception unit, and a transmission unit configured to transmit the policy received by the reception unit and the transition destination calculated by the transition destination calculation unit to the terminal station, and each of the terminal stations determines a connection destination based on the policy and the transition destination transmitted by each of the base stations.