Nippon Telegraph and Telephone Corporation

Nippon Telegraph Telephone Corporation

Riichi Kudo

Masato Mizoguchi

Koichi Ishihara

Takeo Ichikawa

Yasushi Takatori

Munehiro Matsui

Tomoki Murakami

Yusuke Asai

Etsushi Yamazaki

Takayuki Kobayashi

Tadao Nakagawa

Yutaka Miyamoto

Shoko Shinohara

Akihide Sano

Hirantha Abeysekera

Eiji Yoshida

Yasuhiko Inoue

Kohei Mizuno

Takeru Inoue

Masahito Tomizawa

Hideyuki Nosaka

Kahoko Takahashi

Akira Yamada

Yukihiko Okumura

Yoshiaki Kisaka

Akira Kishida

Atsushi Taniguchi

Shogo Yamanaka

Tomoyuki Yamada

Kentaro Nishimori

Eiichi Yamada

Mitsuteru Ishikawa

Takefumi Hiraguri

Seiji Okamoto

Hayato Fukuzono

Yasufumi Morioka

Kengo Horikoshi

Yoshifumi Morihiro

Tomoaki Kumagai

Tomoyoshi Kataoka

Hiroto Yasuda

Wenjie Jiang

Hirantha Sithira Abeysekera

An object is to provide a communication system and a terminal capable of predicting future communication quality in order to enable variations in communication quality due to variations in environment to be addressed. A communication system and a terminal according to the present invention learn an input and output relationship from terminal information such as surrounding environment information of the terminal that can be acquired by a camera, a sensor, or the like, and position information of the terminal and current communication quality to generate a learning model, and predict future communication quality using the learning model, the surrounding environment information and the terminal information.

Communication system and terminal

Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

Wireless communication system and wireless communication method

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.

Wireless signal transmitting method and wireless apparatus

Quality of communication between a terminal and an external communication device in response to control of the terminal is predicted by acquiring surrounding environment information or/and terminal information of the terminal, and the terminal is controlled to improve the communication quality, avoid fatal communication quality degradation, or satisfy a control condition of the terminal for the communication quality, thereby realizing control that satisfies a predefined required condition related to communication.

Terminal and communication system

An event regarding control of a terminal that significantly affects communication quality with which communication between the terminal and an external communication device is performed is predicted by acquiring surrounding information of the terminal using a surrounding environment information collection unit, and a packet loss caused in communication, communication disconnection, and communication quality that does not meet required performance are prevented using communication control to change setting related to communication, such as selection/addition/deletion of a communication counterpart, selection/change of a communication scheme, a change in modulation scheme, coding rate, and number of spatial multiplexings of communication, and a change in setting of an automatic gain controller of a receiver for communication.

Communication device and communication system

An object of the present disclosure is to enable prediction of communication quality in accordance with wireless communication under frequency conditions as combinations of frequencies and frequency bandwidths. The present disclosure provides a system including: an environment information generation unit configured to generate environment information of a terminal that performs wireless communication; a communication prediction model storage unit configured to store a plurality of communication prediction models obtained by learning relationships between the environment information and communication quality of wireless communication under frequency channel conditions; a communication prediction model generation unit configured to select one or more communication prediction models from among the plurality of communication prediction models and use the selected communication prediction models to generate a communication prediction model; and a communication prediction unit configured to input the environment information generated by the environment information generation unit to the communication prediction model generated by the communication prediction model generation unit and predict current or future communication quality of the terminal.

System, device, method and program that predict communication quality

An object is to provide a communication system and a base station capable of predicting future communication quality in order to enable variations in communication quality due to variations in environment to be addressed. A communication system and a base station according to the invention learn an input and output relationship from surrounding environment information of the base station that can be acquired by a camera, a sensor, or the like, terminal information such as position information of a terminal and current communication quality to generate a learning model, and predict future communication quality using the learning model, the surrounding environment information, and the terminal information.

Communication system and base station

An object of the present invention is to provide a mobile terminal capable of predicting fluctuation in communication quality. The mobile terminal according to the present invention uses terminal information consisting of position/orientation/speed/component operation/control command information/camera information/sensor information, and the like of the mobile terminal to model a relationship with communication quality and predict the communication quality using the obtained communication quality prediction model. When fluctuations in communication quality can be predicted, it is possible to cope with the fluctuations (especially deterioration) in communication quality in advance (for example, to change a communication destination station, to decrease a data rate in an application, or to change a control mode of a terminal to a safer mode, by knowing in advance deterioration in quality of a radio signal).

Mobile terminal and communication quality prediction method

A predetermined STA includes a station information collection unit collecting from the STA itself and other STAs station information used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission, and a simultaneous-transmission request unit knowing occurrence of a QoS data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to an AP. The AP includes a station information collection unit; a simultaneous-transmission determination unit selecting a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame; and a trigger transmission unit transmitting to each of the STAs performing the simultaneous transmission a trigger frame instructing to performs the simultaneous transmission and including information necessary for controlling the simultaneous transmission. Each of the STAs designated by the trigger frame is configured to simultaneously transmit the wireless frames to the AP.

Wireless communication system, wireless communication method, wireless LAN access point, and wireless LAN station

Growing community of inventors

Yokosuka, Japan

Riichi Kudo