Kyocera Corporation

Hitachi, Ltd.

Nissan Motor Company Limited

Hitachi Communication Technologies, Ltd.

Yoshimasa Kusano

Taku Nakayama

Chiharu Yamazaki

Kazutaka Nakamura

Shingo Joko

Tetsuya Uda

Hirofumi Nakano

Shigenori Hayase

Takanori Tanaka

Satoshi Asamizu

Takeshi Nakada

Shigehiro Takashima

Ryoichi Miyake

Masatoshi Shibasaki

Eita Miyasaka

Takashi Funada

Yusuke Honda

Daisuke Toyama

Kazuaki Azuma

Kenji Kawamura

Hiromi Murakami

Rei Suzuki

Elichirou Takizawa

Eiichirou Takizawa

A power management apparatus includes a management unit configured to manage data of output power output from a distributed power supply provided in a predetermined facility, a detection unit configured to detect that a user having the distributed power supply is present in a visit space other than the predetermined facility, and a control unit configured to perform, when the user is present in the visit space, interchange processing of providing the output power to the visit space based on the data of the output power.

Power management apparatus, power management system, and power management method

Disclosed is a radio base station (eNB) provided with a storage unit () for storing base station information for selecting the destination of a message, a network communication unit () for transmitting the message to another radio base station selected according to the base station information, and a control unit () for controlling the storage unit () to set as base station information the priority level of the radio base station to which the message was sent according to the state of response to the transmitted message.

Radio base station, radio communication system, and control method

A radio base station (eNB) receives load information indicating the load level of different radio base station (eNB) and adjusts a base station parameter, which is used for defining coverage, in accordance with a result of comparison between the load level of the radio base station (eNB) and that of the different radio base station (eNB). The radio base station (eNB) corrects at least one of the load level of the radio base station (eNB) and that of the different radio base station (eNB), which are compared with each other, in accordance with a number of radio terminals connected to the radio base station (eNB).

Radio communication system, radio base station, and base station parameter-adjustment method

A radio base station (eNB), which is used in a radio communication system that can autonomously adjust, based on load information transmitted/received between radio base stations, the radio base station parameters used for defining coverage, comprises: a network communication unit () that can receive, from another radio base station, first load information indicating the load level of the other radio base station and that can transmit, to the other radio base station, a request for transmission of second load information the information amount of which is greater than that of the first load information; and a control unit () that, when the load level of the other radio base station indicated by the received first load information satisfies a given condition, controls such that the request for transmission of the second load information is transmitted to the other radio base station.

A radio base stationjudges a receiving state of a radio signal in conformity with the orthogonal frequency division multiplexing scheme, and changes a symbol string configuration of a symbol string defined by a size in a frequency axis direction and in a time axis direction, on the basis of the judged receiving state.

Radio communication device and radio communication method

Upon receipt of an RLF Indication message indicating a failure in a handover where a radio base station eNB-is the handover source from the other radio base station eNB, the radio base station eNB-can recognize that its coverage is not adjusted appropriately by referring to the RLF Indication message. Moreover, the radio base station eNB-can adjust coverage appropriately by expanding the radiation area of the antennawhose radiation area is directed toward the other radio base station eNB being the handover target, among the antennasincluded in the radio base station eNB-

Radio communication system, radio base station, and communication control method

A radio base station (eNB-) transmits a Resource Status Update message including first load information indicating the load level thereof to a radio base station (eNB-) when the load level thereof is less than a first threshold, and omits the transmission of the Resource Status Update message including the first load information when the load level thereof is the first threshold or more.

A radio base station () is provided with a stream determination unit () for determining whether communication quality of a radio communication channel between the radio base station () and a receiving device is lower than a predetermined threshold, and an antenna selector () for selecting, from among transmitting antennas (-), transmitting antennas such that the distance between the transmitting antennas (-) becomes shorter than that before the communication quality is determined to be lower than the predetermined threshold when the communication quality is determined to be lower than the predetermined threshold.

A wireless communication apparatus, having a plurality of antennas-to-M and for diversity-combining signals received by the plurality of antennas-to-M, is provided with a combining information calculation unitfor calculating antenna combined amplitude and combining weights based on received power of the plurality of antennas-to-M, a combining unitfor weighting and combining the signals received by the plurality of antennas-to-M based on the combining weights calculated, and a decoding processing unitfor decoding a combined reception signal generated by the combining unit. It thereby improves fading durability of the decoding process by reducing influence of multipath fading caused by arrival waves with delays, even in a case of using only a small number of reception antennas, and maintains a stable reception condition consistently, as well as achieving downsizing of and reduction in cost of hardware.

Wireless communication apparatus and wireless reception method

A wireless communication apparatus having a plurality of antennas-to-M and for diversity-combining signals received by the antennas-to-M, includes a first combining unit () for combining received power of the antennas-to-M based on a first algorithm; a second combining unit (-to-M,) for combining received power of the antennas-to-M based on a second algorithm, which is different from the first algorithm; a determination unitfor determining whether there is a delayed wave based on the received signals; and a control unitfor selecting either one of the first combining unit () and the second combining unit (-to-M,) depending on a determination result by the determination unitand controlling a selected combining unit to combine received power of the antennas-to-M. Thus, it is possible to reduce the influence of multipath fading and maintain a constantly stable reception condition even when the number of reception antennas is small.

In a transmission apparatus of a Gigabit Ethernet signal, in order to improve line efficiency, time division multiplexing is used. Further, if it is possible to branch/insert plural multiplexed Gigabit Ethernet signals at arbitrary nodes, it is possible to construct a more flexible network. For this reason, importance of a time division multiplexing apparatus having a function of branching/inserting Gigabit Ethernet signals is growing. A Gigabit Ethernet signal is monitored at the previous and subsequent stages of a cross connect unit, IFGs are inserted to the signal and switching is waited. If a signal state at the cross connection unit is an IFG, transmission path switching is performed, thereby performing transmission path switching without instantaneous interruption.

Transmission apparatus

A unit timing signal synchronized with a high-order transmission frame is used for measuring a difference between the number of data pieces of a client signal mapped to the high-frequency frame and the number of data pieces of the output client signal by integrating the difference therebetween for each unit timing signal. Then stuffing and de-stuffing operations are performed so that a integration result is zero.

Stuffing and destuffing operations when mapping low-order client signals into high-order transmission frames

Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration.

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Yokohama, Japan

Yoshimasa Kusano