公开(公告)号：US20210344422A1

公开(公告)日：2021-11-04

申请号：US17274383

申请日：2019-08-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota SHIINA ,  Kazutaka HARA ,  Satoshi IKEDA

IPC: H04B10/112 ,  H04B10/079

Abstract: The purpose 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 conditions of an RF wireless link and an optical wireless link. In the optical/RF wireless hybrid communication system and the control method according to the present invention, links for data transmission are not limited to one of an RF wireless link and an optical wireless link, the quality of link conditions is determined from signal quality received through channels of both the RF wireless link and the optical wireless link, and the distribution of data to be transmitted through the respective links is determined on the basis of the determination result. Thus, the links can be flexibly switched depending on the transmission conditions such as disturbance.

公开(公告)号：US20220360332A1

公开(公告)日：2022-11-10

申请号：US17620969

申请日：2020-06-10

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04B10/2575

Abstract: The present disclosure aims to make it possible to simultaneously establish communication between many freely-selected radio terminals without using a complex relay network or a plurality of radio relays. The present disclosure is a communication network system including: a plurality of optical-radio converters 521-1 to 521-n that convert a radio signal and an optical fiber radio signal into each other; and a path controller that is connected to the plurality of optical-radio converters 521-1 to 521-n through optical fiber transmission lines 531-1 to 531-n, receives input of an optical fiber radio signal transmitted from any optical-radio converter of the plurality of optical-radio converters 521-1 to 521-n from the optical fiber transmission line connected to the optical-radio converter, and outputs the optical fiber radio signal to the optical fiber transmission line connected to a set optical-radio converter of the plurality of optical-radio converters 521-1 to 521-n.

公开(公告)号：US20220263673A1

公开(公告)日：2022-08-18

申请号：US17627845

申请日：2019-07-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshihito FUJIWARA ,  Yasunobu KASAHARA ,  Satoshi IKEDA

IPC: H04L12/18 ,  H04L67/02

Abstract: An object of the present disclosure is to enable content to be efficiently transferred in an HTTP-based web delivery system while maintaining a unicast HTTP and further avoiding the limitations associated with the multicast.
In the present disclosure, a unicast-multicast converting apparatus 105, a multicast-unicast/multicast-multicast converting apparatus 113, and a multicast-unicast converting apparatus 114 are connected to a network between a content server 106 performing web delivery and a terminal 117 using a multicast communication networks 102 and 112. Through the multicast-unicast/multicast-multicast converting apparatus 113, a content group each including a plurality of contents grouped is transferred both in multicast and unicast.

公开(公告)号：US20210227387A1

公开(公告)日：2021-07-22

申请号：US17059107

申请日：2019-05-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takahito KIRIHARA ,  Satoshi NARIKAWA ,  Satoshi IKEDA

IPC: H04W12/065 ,  H04W76/00 ,  H04W72/04

Abstract: A communication method performed by a communication system including an authentication device and a subscriber line system includes: determining by the authentication device, in response to a request for communicative connection from a user terminal that establishes a communicative connection via the subscriber line system, whether the user terminal is allowed to establish the communicative connection; and controlling, by the subscriber line system, the communicative connection established by the user terminal, by dynamically allocating a bandwidth in accordance with a request from the user terminal based on a result of the determining.

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：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.