Nec Corporation

The University of Electro-communications

Oki Data Corporation

Other

Oki Electric Industry Co., Ltd.

Unicharm Corporation

Takeo Fujii

Kaoru Narita

Yoko Horiguchi

Kazushi Muraoka

Masayuki Ariyoshi

Yoshinori Matsui

Tsuyoshi Takahashi

Yoshinori Takahashi

Mitsuru Kishimoto

Hideyuki Kobayashi

Shigenori Koido

Toshio Komuro

Noboru Ooishi

Kiyoshi Ikeda

Masahiko Shimosugi

Seiichi Hannai

Hiroshi Furuta

Kohtaroh Yoshimura

Kensuke Fujii

Yuko Fukui

Nobuko Uchibori

Hiroyuki Ueki

Mai Ohta

Masaki Kawaguchi

Hiromasa Uchiyama

Erina Kojima

A communication device, a communication method and a communication system that enable an increase in channel capacity at cell edges of a plurality of cells. Data transmission is implemented by transmission stations, which are base stations of adjacent cells, by MIMO transmission. A relay station receives radio waves that are transmitted by both the transmission station and the transmission station, and acquires data transmitted by the transmission station and data transmitted by the transmission station. The relay station transmits data to reception stations in adjacent cells according to multi-user MIMO transmission. The data transmitted by the transmission station is received by the reception station via the relay station, and the data transmitted by the transmission station is received by the reception station via the relay station. The present invention can be used in cellular systems.

Communication device, communication method and communication system

In cooperative sensing in which a plurality of cognitive radio apparatus collaboratively exchange sensing information on a status of frequency band usage as a secondary system, the sensing information is efficiently exchanged in the secondary system without influencing communication of the primary system. In a radio communication system according to this invention, a first radio communication device includes means for observing a surrounding radio communication environment, means for converting information obtained by the observation into a parameter used for radio communication, and means for performing transmission by using the parameter, and a second radio communication device includes means for receiving a signal transmitted from the first radio communication device and means for extracting, from the received signal, information on the surrounding radio communication environment that is observed on a transmission side.

Radio communication method, radio communication device, radio communication program, and radio communication system

Provided is a radio communication system including a plurality of cognitive radio apparatuses each including at least: a transmission/reception element; and a detection element for detecting a radio wave transmitted from a radio apparatus of another radio communication system, in which the radio communication system further includes a control section for determining a frequency band on which each cognitive radio apparatus of a radio apparatus group including the plurality of cognitive radio apparatuses is to detect the radio wave.

Radio apparatus, radio communication system, and method for detecting radio wave

After checking a status of frequency band usage of a primary system by preliminary sensing, a master node transmits to slave nodes a sensing request containing a target frequency band for cooperative sensing. The slave nodes perform spectrum sensing according to specified parameters and send, as responses, results thereof to the master node. The master node collectively receives these results, comprehensively determines the sensing results of the slave nodes, and makes a final determination on whether or not the target frequency band is available.

Communication system, radio communication method, and radio apparatus

The degradation of the communication characteristics and the throughput of the entire network can be improved. The failures of sending and receiving are reduced and the transmission time is reduced. In a multi-hop communication method how the source terminaltransmits and receives the packets with destination terminalthrough at least one relay terminal, the relay terminaland/or the destination terminalincludes a table TBL of use channel candidates that is issued by the source terminal, and the relay terminaland/or the destination terminalselects a use channel for sending the data packets from the channel candidates registered in the table and sends the data packets.

Multi-hop communication method, a multi-hop communication terminal and communication program

This invention provides a communication system, a repeater terminal in the communication system and a communication method for improving the characteristics in a multi-hop communication by a diversity gain and reduces the power consumption by wasteful retransmission in packet transmission at a wireless terminal. When a transmitter terminal S sends a packet first time, repeater terminals R-Rperform a data transmission by retransmission at all the terminals which received the packet. When a transmitter terminal S sends a packet second time, a repeater terminal determines its own contribution based on the hop numbers of the repeating in the packet transmission and the return ACK (or NACK) repeating. The repeater terminal with a high contribution autonomously determines to be in 'repeater mode' and the repeater terminal with a low contribution autonomously determines to be in 'sleep mode'.

Communication system, a repeater terminal in a communication system and a communication method

There is developed a label which enables purchasers or ordinary consumers to identify suitable commodity products at a glance, thereby providing facilities for consumers when they purchase commodity products. A target user information label section corresponding to a target user of paper diapers packed in a package is printed at a position conspicuous for ordinary consumers on the surface of the package, along with a tradename of the paper diapers. All target user designs corresponding to all target users of paper diapers to be handled as commodities are displayed as a single set in the information label section. A specific target user design corresponding to a target user of the paper diapers packed in the package is displayed greater in size than the other target user designs belonging to the set.

Information label for target user, and display package having the label

Method of fabricating a semiconductor device in which no side walls are formed adjacent the gates of the MOSFETs of the memory cell

An ink jet recording apparatus is provided with a black head and a plurality of color heads. The black head has a predetermined number of first orifices aligned at predetermined intervals (e.g. 0.0169 mm) in a sub scanning direction (direction in which a print medium travels). The plurality of color heads eject different colored ink drops. Each color head has the predetermined number of second orifices aligned in the sub scanning direction perpendicular to the main scanning direction. The second orifices of adjacent color heads are aligned in a main scanning direction perpendicular to the sub scanning direction.

Ink jet recording apparatus

A semiconductor integrated circuit device is configured using a DRAM and an SRAM between which data transfer is performed by way of a data transfer circuit using data transfer bus lines. Herein, the DRAM is divided into at least two DRAM arrays, each of which contains a number of columns each consisting of memory cells. In addition, the columns are arranged in mixture in connection with external I/O terminals respectively in such a way that columns respectively containing memory cells which are simultaneously subjected to read operations within a same cycle are arranged not to adjoin each other. Thus, it is possible to reduce a probability in which multiple memory cells which are simultaneously subjected to read operations within the same cycle exist within a range of an area under influence of charged particles, which are produced locally due to neutrons. Even if data of memory cells which are concentrated at a certain region are simultaneously placed under influence of the charged particles, it is possible to remarkably reduce a number of chances in that multiple bits of data being read out to the external I/O terminals go defective simultaneously.

Semiconductor integrated circuit device

In a semiconductor circuit device, an internal circuit, a common wiring pattern, a plurality of external terminals including a ground terminal, and a plurality of protection elements is provided. Each of the plurality of protection elements is connected to one of the plurality of external terminals and the common wiring pattern. Each protection element includes a clamp circuit. The clamp circuit of each of the plurality of protection elements respectively connected to the plurality of external terminals other than the ground terminal has a clamp voltage higher than a power supply voltage supplied to the internal circuit. On the other hand, the clamp circuit of the protection element connected to the ground terminal as a ground terminal clamp circuit has a clamp voltage lower than those of the clamp circuits other than the ground terminal clamp circuit.

Semiconductor circuit device with high electrostatic breakdown endurance

A Semiconductor integrated circuit with a protection circuit against electrostatic discharge. A clamping element is connected with MIS transistor to prevent the breakdown under the charged device model. A parasitic bipolar transistor, a MOS transistor or MIS transistor whose gate is composed of an insulating film thicker than that of the transfer gate, can be used as the clamping element.

Semiconductor integrated circuit with protection circuit against electrostatic discharge

A semiconductor device includes a metal terminal provided on a semiconductor substrate and a protection element. The protection element includes an insulated gate field-effect transistor. The transistor has a first diffusion layer of a reverse conductive-type formed on one conductive type region of the semiconductor substrate and connected to the metal terminal, as its source. The transistor also includes a second diffusion layer of a reverse conductive-type connected to an electrode wire having a constant electric potential, as its source, and has a gate electrode connected to the electrode wire. A lateral bipolar transistor includes a third diffusion layer of a reverse conductive-type formed with a constant spaced distance with respect to the second diffusion layer and connected to the metal terminal, as its collector, and also has the second diffusion layer as its emitter, and furthermore has the one conductive-type region as its base. Thus, a semiconductor device is protected from an electrostatic discharge (ESD) breakdown device even though having high density and a high operating speed.

Semiconductor device and method of making the same

A lead on chip (LOC) semiconductor device or a chip on lead (COL) semiconductor device with a protection circuit. Non-connection pins are made shorter than connection pins to reduce the inductance of the non-connection pins, or to obtain a different capability of the protection circuit for non-connection pins with respect to connection pins. The time constant of the protection circuit for the non-connection pins is made longer than that of the protection circuit for the connection pins. Further, the clamping capability for the connection pins is made greater than that for another connection pin adjacent to the connection pin.

Semiconductor device with protection circuit

A recording apparatus has a print head with an ink tank for supplying ink to the print head. The ink tank is carried together with a print head on a carriage, which is moved over a print medium so that the print head prints data on the print medium. The ink tank has an ink-empty sensor which outputs a first signal upon detecting that the ink in the ink tank has decreased to a lower limit. A controller causes the carriage to move to an ink-refilling position in response to the first signal. Then, the controller causes an ink-refilling mechanism to refill the ink tank with ink from an ink reservoir located above the ink tank. The ink tank also has an ink-full sensor which outputs a second signal upon detecting that the ink in the ink tank has increased to an upper limit. The ink-refilling mechanism stops an ink-refilling operation in response to the second signal. A timer may be used in place of the ink-full sensor. The timer outputs an output a predetermined time length after initiation of the ink-refilling operation, and the ink-refilling mechanism completes ink-refilling operation in response to the output of the timer.

Growing community of inventors

Tokyo, Japan

Takeo Fujii