Nippon Telegraph and Telephone Corporation

Satoshi Narikawa

Tomohiko Ikeda

Takuya Abe

Satoshi Ikeda

Tatsuya Fukui

Takashi Watanabe

Katsuya Minami

Kazuhiko Kinoshita

Takahito Kirihara

Shunsuke Saruwatari

Ryota Shiina

Hiroya Ono

The present disclosure is a noise cancellation system including: a microphone that converts a sound wave into an electrical signal; a transmission line that propagates the electrical signal from the microphone; a speaker that reproduces a sound wave from the electrical signal from the transmission line; a phase inversion circuit that is provided between the microphone and the speaker, and inverses the phase of the electrical signal; a gain adjustment circuit that is provided between the microphone and the speaker, and adjusts a gain for amplifying the electrical signal; and a delay adjustment circuit that is provided between the microphone and the speaker, and adjusts the amount of delay of the electrical signal.

Noise canceling system and noise canceling method

The present invention has an object to provide an uplink band allocation apparatus and an uplink band allocation method that are capable of setting an uplink band of a PON in accordance with an application. The uplink band allocation apparatus and method according to the present invention collect not only the amount of the data accumulated in an ONU but also the information of the application (application information) used on a terminal apparatus. Then, the uplink band allocation apparatus and method according to the present invention reflect, on a DBA conducted by the OLT, information of a band and a delay (band delay information) that have been calculated by an application information acquisition server from the application information and that are demanded by the application.

Upbandwidth allocation device and uplink bandwidth allocation method

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

Communication system

An object of the present disclosure is to enable each ONU to generate a plurality of logical paths corresponding to the number of terminal devices connected to the ONU without setting a plurality of MAC addresses in each ONU. An optical network unit according to the present disclosure includes an ID acquisition unitthat acquires ID information unique to a terminal devicefrom the terminal device; a virtual MAC address generation unit that generates a virtual MAC address for the optical network unit by using the acquired ID information; a connection identification unit that generates a logical path between the optical network unit and an optical line terminal by using the generated virtual MAC address as a MAC address for an LLID (Logical Link ID); and a signal processing unit that refers to a table in which the identification information acquired by the virtual MAC address generation unit and the LLID are associated with each other to pass, to the terminal device, data transmitted and received using the logical path generated by the connection identification unit.

Optical network unit, communication network system and communication method

An object of the present disclosure is to enable an ONU to acquire ID information of terminal devices even when a network device is connected between the ONU and the terminal devices, and to thereby enable generation of a logical path between the ONU and the OLT. The present disclosure relates to an optical communication network system configured to connect a terminal device and a passive optical network (PON) system via a network device. The PON system includes an optical line terminal and an optical network unit connected using an optical transmission line. The network device is configured to acquire ID information of the terminal device, and notify the optical network unit of the acquired ID information. The optical network unit is configured to acquire ID information of the terminal device from the network device, and generate a logical path to the optical line terminal on the optical transmission line using the acquired ID information.

Optical communication network system, optical network unit, and optical communication method

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.

Communication method, communication system, authentication apparatus and user terminal device

An object of the present disclosure is to enable an ONU to acquire ID information of terminal devices even when a network device is connected between the ONU and the terminal devices, and to thereby enable generation of a logical path between the ONU and the OLT. The present disclosure relates to an optical communication network system configured to connect terminal devices and a passive optical network (PON) system via a network device. The PON system includes an optical line terminal and an optical network unit connected using an optical transmission line. The optical network unit is configured to construct a tunnel to the network device, acquire ID information of the terminal devices connected to the network device from the terminal devices via the tunnel, and generates a logical path to the optical line terminal on the optical transmission line using the acquired ID information.

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-to-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-to-through optical fiber transmission lines-to-, receives input of an optical fiber radio signal transmitted from any optical-radio converter of the plurality of optical-radio converters-to-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-to-

Growing community of inventors

Musashino, Japan

Satoshi Narikawa