Fujitsu Corporation

Tadanori Yokosawa

Masanori Hashimoto

Takashi Kanda

Yuki Shinada

Daisuke Nitta

Satoshi Maruyama

Yasuo Tezuka

Kayo Motohashi

Hirokazu Shimada

Hiroyuki Sekino

Takahiro Kawaguchi

Nao Miyazaki

Hitoshi Nakazawa

Kazutomo Tsuji

Hidekazu Kuniyoshi

Masamitsu Komi

Tamotsu Inoue

Eiichi Ohyama

An optical network system includes an optical line terminal, an optical splitter that is connected to the optical line terminal via one first optical fiber, and a plurality of optical network units that are connected to the optical splitter via respective second optical fibers. The plurality of optical network units communicate with the optical line terminal using an optical signal of a working wavelength uniquely assigned to each of them. The optical line terminal communicates with an optical network unit that is connected to the optical splitter using an optical signal of a working wavelength and an optical signal of a spare wavelength that is common to a plurality of optical networks.

Optical network system and optical communication method

An RRH includes a power supply device, an AISG interface, a PA, and a control unit. The PA is operated by a power source with a first voltage or a second voltage that is lower than the first voltage and amplifies a transmission signal. The AISG interface is connected to an antenna control device operated by the power source with the second voltage. The power supply device supplies the power source to the PA and the power source to the antenna control device to the AISG interface. When the antenna control device is operated, the control unit controls such that the power supply device generates the power source with the second voltage, supplies the generated power source to the PA and the antenna control device, and increase power of the transmission signal output from the PA that is operated by the power source with the second voltage.

Remote radio equipment

A management apparatus that identifies a candidate for improving communication quality in a wireless communication system including a base station and a mobile station, the management apparatus comprising: an obtainer that obtains measured communication quality information and positional information from the mobile station; a communication quality estimator that estimates a communication quality based on the positional information obtained from the mobile station; a communication path determiner that identifies a communication path using the estimated communication quality estimated and the measured communication quality information; and a communication quality improvement candidate determiner that identifies the candidate for improving communication quality related to the communication path determined, the candidate being based on communication quality. A method and a program for identifying a candidate for improving communication quality, an apparatus, a method, and a program for determining a communication path, and a wireless communication system are also provided.

Management apparatus and method for identifying candidate for improving communication quality; apparatus and method for identifying communication path; non-transitory computer-readable storage medium storing such programs; and wireless communication system

A relay device in a system in which a transmission signal of a base station is relayed via a plurality of relay devices, includes: a first antenna configured to receive the transmission signal; a second antenna configured to communicate a target relay device being a relay destination relay device for the transmission signal; a communication unit configured to perform notification of setting information of the first and second antennas to other relay devices including the target relay device, and communication for acquiring setting information of the other relay devices; and an analysis unit configured to analyze a cause of a relay status lower than a criterion when the relay status of the transmission signal is lower than the criterion.

Relay device and method of adjusting relay device

A plurality of base transceiver stations and at least one extension device are connected, via an IP network that uses internet protocol. The extension device shares resources of the base transceiver stations by arbitrary changing a connection relationship between the base transceiver stations and the extension devices. When a mobile terminal communicates with a core network, the extension device uses the resources of at least one base transceiver stations according to fluctuation in the amount of traffic.

Radio communication system, base transceiver station, and extension device

Growing community of inventors

Yokosuka, Japan

Tadanori Yokosawa