公开(公告)号：US20240121780A1

公开(公告)日：2024-04-11

申请号：US17768456

申请日：2020-10-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota SHIINA ,  Tatsuya FUKUI ,  Satoshi NARIKAWA ,  Katsuya MINAMI ,  Satoshi IKEDA ,  Shunsuke SARUWATARI ,  Takashi WATANABE ,  Kazuhiko KINOSHITA

IPC: H04W72/20 ,  H04B10/2575 ,  H04B10/27 ,  H04W88/10

CPC classification number: H04W72/20 ,  H04B10/2575 ,  H04B10/27 ,  H04W88/10

Abstract: An object is to provide a communication system in which there are no restrictions on a communicable area and it is not necessary to install communication software on a wireless device. A communication system according to the present invention is configured so that the functions of a wireless access point are separated into a front-end unit on a wireless terminal side and a back-end side on the Internet side, radio signal processing functions supporting a wireless scheme of the wireless terminal are deployed only on the back end, and only relatively simple processing functions such as E/O conversion are deployed on the front end near the wireless terminal 311.

公开(公告)号：US20240063906A1

公开(公告)日：2024-02-22

申请号：US18270394

申请日：2021-01-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota SHIINA ,  Toshihito FUJIWARA ,  Shinya TAMAKI ,  Tomohiro TANIGUCHI

IPC: H04B10/112 ,  H04W28/02

CPC classification number: H04B10/1129 ,  H04W28/0231

Abstract: An object of the present disclosure is to reduce a system load imbalance between APs and unfairness in communication quality between users subordinate to each AP.
The present disclosure includes: a plurality of radio base stations that perform wireless communication with terminals; a plurality of optical base stations that are arranged in a communication area of at least one of the plurality of radio base stations and transmit, to a terminal by using an optical signal, an optical ID indicating connection information and authentication information for communicating with an available radio base station among the plurality of radio base stations; and a base station control device that collects, from individual radio base stations, communication quality information of the terminals, determines a deviation in the communication quality of the terminals between the plurality of radio base stations, and when the deviation occurs in the communication quality of the terminals between the plurality of radio base stations, causes fewer optical base stations to transmit the optical ID for communicating with the radio base station having the deviation.

公开(公告)号：US20240053430A1

公开(公告)日：2024-02-15

申请号：US18271520

申请日：2021-01-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shinya TAMAKI ,  Ryota SHIINA ,  Tetsuya SUZUKI ,  Yasutaka KIMURA ,  Tomohiro TANIGUCHI ,  Sei KOU ,  Tomoya HATANO ,  Takashi YAMADA

IPC: G01S5/02 ,  H04W64/00 ,  G01S5/00

CPC classification number: G01S5/0289 ,  H04W64/00 ,  G01S5/0036

Abstract: An object of the present invention is to provide a position estimation system capable of grasping position information of a plurality of wireless devices without using an external device such as a fixed beacon or a GPS, a position estimation method, a wireless device, and an analysis device. A position estimation system according to the present invention includes a plurality of wireless devices 11 and an analysis device 12, wherein the wireless devices 11 are each configured to: send beacon signals; transfer the beacon signals between the wireless devices 11 in a range that the beacon signals reach; update flags indicating transfer histories of the beacon signals at the time of transfer; and discard beacon signals sent by own wireless devices upon reception thereof. Any one of the wireless devices 11 is configured to collect the beacon signals, and the analysis device 12 analyzes the flags of the respective beacon signals collected by the wireless device 11-0, to estimate positions of the plurality of wireless devices 11.

公开(公告)号：US20230396605A1

公开(公告)日：2023-12-07

申请号：US18032770

申请日：2020-10-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshihito FUJIWARA ,  Tatsuya FUKUI ,  Tomohiro TANIGUCHI ,  Tomohiko IKEDA ,  Hiroya ONO ,  Ryota SHIINA

IPC: H04L9/40

CPC classification number: H04L63/083

Abstract: An object of the present invention is to provide a network authentication system and a network authentication method capable of highly securely authenticating connection or a use place of a device without depending on a connection interface system in a mode in which a device such as audio/video equipment is directly connected to a public network. A network authentication system according to the present invention generates authentication information by a device other than a device such as audio/video equipment, and transmits the authentication information to the device as a media signal.

公开(公告)号：US20230130486A1

公开(公告)日：2023-04-27

申请号：US17915850

申请日：2020-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota SHIINA ,  Tomohiro TANIGUCHI ,  Kazutaka HARA ,  Shinya TAMAKI ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC: H04B10/112 ,  H04B10/2575 ,  H04W4/90 ,  H04W4/38

Abstract: An object of the present disclosure is to inform a user of a safe evacuation guidance route in real time using smart lightings without deploying dedicated evacuation guidance facilities.
The present disclosure is a wireless communication system including: one or more wireless base stations that wirelessly communicate with a terminal; a plurality of optical base stations that transmit an optical signal to the terminal; and a base station control device that controls the optical signal transmitted by the optical base stations, wherein the base station control device collects environment information around the optical base stations, detects a disaster around the optical base stations using the collected environment information, and when detecting a disaster, causes the optical base station installed at a position close to a disaster occurrence location and the optical base station installed at a position far from the disaster occurrence location to output light of different colors.

公开(公告)号：US20220361070A1

公开(公告)日：2022-11-10

申请号：US17619663

申请日：2019-06-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota SHIINA ,  Kazutaka HARA ,  Tomohiro TANIGUCHI ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC: H04W36/08 ,  H04B10/079 ,  H04B10/112

Abstract: The present disclosure aims to enable communication to be performed with stable quality even when a user uses a terminal while moving. In the wireless communication system according to the present disclose, a switching control unit 15 sets switching illuminance pth for maintaining illuminance of an optical signal received by a terminal 91 at requested illuminance corresponding to throughput or higher during the time until connection switching between the communication with an optical wireless access point 92 and the communication with an RF wireless access point 93 is completed, and when the received illuminance p becomes lower than the switching illuminance pth during connection with the optical wireless access point 92, the switching control unit 15 performs connection switching from the optical wireless communication to the RF wireless communication.

公开(公告)号：US20220352993A1

公开(公告)日：2022-11-03

申请号：US17624126

申请日：2019-07-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro TANIGUCHI ,  Ryota SHIINA ,  Kazutaka HARA ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC: H04B10/85 ,  H04B10/112 ,  H04W12/06

Abstract: An object is to provide a communication system, a base station, and a communication method that can avoid a state in which an RF wireless communication cannot be started due to the quality of optical wireless communication.
In an optical communication system according to the present invention, a base station device repeatedly transmits an authentication information frame addressed to a terminal device at a predetermined cycle by the optical wireless communication, the frame including authentication information for connection to the terminal device by the RF wireless communication. Even if the terminal fails to acquire the authentication information at a certain timing due to the quality of optical wireless communication, the communication system has a mechanism that acquires the same authentication information at regular time intervals, so that terminal authentication processing can be performed at the time when the terminal acquires the authentication information.

公开(公告)号：US20210266071A1

公开(公告)日：2021-08-26

申请号：US17262976

申请日：2019-07-23

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Ryota SHIINA ,  Kazutaka HARA ,  Satoshi IKEDA

IPC: H04B10/2575 ,  H04B17/309 ,  H04W24/02 ,  H04B10/079

Abstract: An object of the present invention is to provide an optical/RF wireless hybrid communication system and a control method capable of solving the instability of link states of an RF wireless link and an optical wireless link. According to an optical/RF wireless hybrid communication system and a control method of the present invention, when data is transmitted, the link is not limited to one of an RF wireless link and an optical wireless link, a link state is determined based on signal quality received in channels of both the RF wireless link and the optical wireless link, and a distribution of data to be transmitted in each link is determined based on a result thereof. For this reason, the link can be switched according to circumstances of the transmission state due to an external disturbance and the like.