Nec Corporation

Canon Kabushiki Kaisha

Picocela Inc.

Kabushiki Kaisha Toshiba

Sony Corporation

Sumco Techxiv Corporation

Ns Solutions Corporation

Strapack Corporation

Nec Corporporation

Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Hiroshi Furukawa

Koichi Ebata

Yoshinori Watanabe

Mutsuhide Matsuda

Kojiro Hamabe

Shousei Yoshida

Masao Aoyagi

Ryoichi Suzuki

Tokuichi Tsunekawa

Takashi Uchiyama

Fumio Ito

Akihisa Ushirokawa

Toshikazu Ichiyanagi

Ryuji Suzuki

Shigeru Kamata

Akira Tajima

Morihisa Momona

Takafumi Esaki

Yasuhiro Fukuda

Yoshiyuki Uto

Masami Shimizu

Kazuhiro Okanoue

Shuntaro Yamazaki

Yoshio Komine

Kiyoshi Takahashi

Tomoshi Takigawa

Keiichi Yasuda

Mitsutoshi Ogiso

Yuji Sato

Akio Suzuki

Masao Kondo

Kazuya Hosoe

Hideki Kohno

Masaru Ohtsuka

Susumu Kurihara

Ryusho Hirose

Masaaki Takada

Tokio Shibazaki

Kenichi Enda

Yoshikatsu Aizawa

Seiichiro Koyama

Ryuichiro Kai

Shirou Yoshino

Mitsutaka Kimura

Hiroyuki Matsuyama

Junko Teshima

Yoshihide Kurimoto

Takayuki Fujishima

A control signal used for selecting a parent node in a tree route is transmitted from a first wireless node among a plurality of wireless nodes which constitute a backhaul network. Second wireless nodes each select, as a parent node, one of transmission source nodes of a plurality of control signals on the basis of an index indicating the radio wave propagation quality of a route through which each of the control signals received from different route has been propagated. Fixed wireless nodes among the second wireless nodes each transmit the received control signal to the other second wireless nodes, and a movable wireless node among the second wireless nodes terminates the received control signal.

Wireless route control method, wireless communication system, and wireless node

A first wireless node transmits a control signal to be propagated to each of a plurality of wireless links linked up between a plurality of wireless nodes that forms a backhaul network. Each of second wireless nodes that is different from the first wireless node selects, for a transmission route of a data signal, a wireless link corresponding to one of different routes in an upstream direction toward the first wireless node among the linked up wireless links, based on an indicator indicative of a radio wave propagation quality of one or more wireless links through which a plurality of the control signals received from different routes are propagated.

Controlling tree topology over mesh topology based on autonomous decentralized control

The present invention proposes a network system, etc., that are suitable for improving the communication efficiency of an entire network even when a CSMA, etc., are adopted. A network system for transmitting uplink/downlink traffics using a route having a tree structure with a root node, a plurality of inner nodes, and a plurality of leaf nodes, wherein the root node transmits a downlink frame to the inner nodes and leaf nodes at intervals equal to or greater than an additional wait time differing for each destination node. The root node transmits a downlink frame at, for example, an interval consisting of the additional wait time plus a quality assurance time for assuring communication quality. An interval which is a varying time interval but equal to the additional wait time at the least is assured, whereby the communication efficiency of an entire network is improved.

Network system, node, frame communication method, and program

An information processing device includes: a first acquisition unit that acquires authorization omission information being information indicating how many save units among a plurality of save units in which object pieces of an object divided into a division number are stored respectively do not need authorization processing, based on the division number indicating how many object pieces the object is to be divided into and a restoration number being a number of object pieces required to restore the object; and a decision unit that decides a save unit which does not need the authorization processing from among the plurality of save units, based on the authorization omission information acquired by the first acquisition unit.

Information processing device, authorization system, information processing method, and recording medium

A display unit includes: a display section having a plurality of light-emitting devices arranged in a straight line; a driving section supplying a display driving signal for controlling the luminance of each of the light-emitting devices; and a display control section connected to the driving section for supplying the driving section with either a first display control signal for controlling the luminance of the light-emitting devices to display a preset display pattern according to an operation control signal from a controller or a second display control signal for controlling the luminance of the light-emitting devices in synchronism with the level of an audio signal, wherein the first display control signal is generated based on a wave function.

Display unit

A transmission power control technique allowing stable and reliable signal transmission in soft handover is disclosed. Each of the base stations involved in soft handover measures an amount of loss of the base station selection signal. When the amount of loss of the base station selection signal exceeds a threshold, the transmission power of the downlink signal is not set to the minimum level but to the normally controlled level. Further, a transmission power update timing of each base station is determined so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations.

Transmission power control method and system

The above base-station cell design method is for sequentially adding base stations, and a technique of which throughput is few is employed for a radio-wave propagation characteristic evaluation to be made in this addition, and a technique of which the throughput is much, but which is of high-precision, more specifically, a technique such as the ray tracing is applied for the radio-wave propagation characteristic evaluation to be made after addition. The result of the high-precision radio-wave propagation characteristic evaluation to be made after this addition is put to practical use for estimating an interference quantity in selecting the arrangement location of the base station to be added newly. This allows the quantity of the radio wave analytic processing, which accounts for a large majority of the base-station cell design processing, to be reduced, thus enabling a fast base-station cell design.

Base-station cell design method and base-station cell design apparatus, and program thereof in mobile communication system

A control packet is broadcast over a route, containing first and second metric values of different transmission characteristics of the route. At a local node, control packets from multiple nodes are received and examined for their source. If the packets are received from upstream nodes, the metrics of the received packets are updated, the second metric is weighted and summed with the first metric to produce a number of combined metrics and a minimum value of the combined metrics is detected. One of the routes having the detected value is selected as a route to an upstream node. If the control packets are received from downstream nodes, the second metric is weighted and summed with the first metric to produce a number of combined metrics and a smaller values of combined metrics are detected corresponding in number to usable antennas and routes of the detected values are selected.

Route selection in a communications network using combined values of metrics of different characteristics

A method of subjecting a silicon wafer doped with boron to a heat treatment in an argon atmosphere, wherein the argon atmosphere is replaced with a hydrogen atmosphere or a mixed gas of an argon gas and a hydrogen gas in a proper fashion, to thereby uniformize a boron concentration in the thickness direction of the surface layer of the silicon wafer doped with boron.

Method of heat treatment of silicon wafer doped with boron

A radio network can select a route of minimum path loss among entire relay routes and can set the relay route so as to satisfactorily resist interference. The radio network has a core node connected to a wired network, relay nodes each relaying at least one of a down-link data packet transmitted from the core node and an up-link data packet directed toward the core node, and a terminal station capable of transmission and reception of data packets with both the core node and the relay node. The relay node has total path loss optimized to be minimum between relay nodes included in a relay route of the data packet or between the relay node and the core node or both.

Radio network, relay node, core node, relay transmission method used in the same and program thereof

Growing community of inventors

Tokyo, Japan

Hiroshi Furukawa