Nec Communication Systems, Ltd.

Advanced Telecommunications Research Institute International

Advanced Telecommunications Research Institute Int

A School Corporation Kansai University

Nec Communications, Ltd.

Hiroyuki Yomo

Yoshihisa Kondo

Masahito Iwai

Takatoshi Kimura

Suhua Tang

Yukihiro Hara

Tetsuya Ito

Sadao Obana

Akio Hasegawa

Koichi Yoshimura

Akira Matsumoto

Hiroyuki Iizuka

Toshiyasu Tanaka

Yuta Okamoto

Shota Kakibuti

Ryou Nagase

Shohei Fukayama

Hironori Fukui

Noboru Miyamoto

Yuma Asada

A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.

Program executed in transmitter, receiver and program executed in receiver

A wireless device () searches a database that stores positional information of the wireless device (), a device (-) and control identifiers for controlling the devices (-) in an associated manner, acquires a device (-) located near the wireless device () and a control identifier for controlling the device (-) based on the positional information of the wireless device (), and, based on the device (-) and the control identifier for controlling the device (-) that have been acquired, determines a controlled device (at least one of the devices (-)) and generates a control identifier for the controlled device. The wireless device () transmits, by wireless communication, the generated controlled identifier to a receiver mounted on the controlled device to control the controlled device.

Wireless device, controlled device controlled by the same, control system including a wireless device and controlled device, and program for causing a computer in a wireless device to control a controlled device

A wireless base station () includes a wakeup device () and a main device (). When the main device () is in a sleep mode, the wakeup device () is connected to the antenna (). Then, when the wakeup device () receives a wakeup signal for activating the wireless base station () from a terminal device assigned to the wireless base station () in a communication band used for wireless communication with the terminal device and when the information for identifying a wireless base station to be activated contained in the received wakeup signal is identical with the identification information of the wireless base station (), the wakeup device () outputs a driving signal to the main device (). The main device () transitions from the sleep mode to an operating mode in response to the driving signal from the wakeup device ().

Wireless base station and wireless communication systems using the same

A receiver has an ID that includes three signal detection intervals (S, S, S). The three signal detection intervals (S, S, S) are detected as the receiver detects a signal consisting of a value larger than a threshold at each of the detection timings (DTto DT). The transmitter transmits four radio frames (FRto FR) such that each of the radio frames straddles the corresponding one of the detection timings (DTto DT) in the receiver.

Transmitter, transmission method used by the same, receiver for receiving a radio signal from transmitter and wireless communication system including the same

Wireless base station and wireless communication system using the same

A terminal device () frame-length-modulates an identifier of the radio apparatus () to generate a plurality of frames having a plurality of frame lengths, and transmits the generated plurality of frames to an access point () over wire or wireless communication. The access point () transfers the plurality of frames transmitted by the terminal device () to the radio apparatus () in the IP or MAC layer. The radio apparatus () detects the plurality of frame lengths of the plurality of frames received from the access point () and decodes the detected plurality of frame lengths to obtain an identifier. If the obtained identifier matches the identifier of the radio apparatus (), the radio apparatus () transitions to active mode.

Communication system, communication method, radio apparatus in communication system and program executed by terminal device in communication system

A terminal devicetransmits a wireless frame having a frame length or amplitude that represents the ID of a wireless base stationto be woken up to the wireless base station. The wireless base stationdetects the wakeup ID from the frame length or amplitude of the wireless frame from the terminal device, and, if the detected wakeup ID is identical with its own ID, transitions from a sleep mode to an operating mode. In this case, the wireless frame is the same wireless frame as that transmitted and received by the wireless communication module of the terminal deviceto and from the wireless base station

Terminal device, wireless base station wirelessly communicating with the same, and wireless communication system using terminal device and wireless base station

A transmitter incorporates a table (TBL1) for assigning the frame lengths of 560 &#x3bc;s and 600 &#x3bc;s to the code '0' in a binary system and assigning the frame lengths of 600 &#x3bc;s and 560 &#x3bc;s to the code '1' in the binary system. The transmitter refers to the table (TBL1) and assigns the two frame lengths of 560 &#x3bc;s and 600 &#x3bc;s and the two frame lengths of 600 &#x3bc;s and 560 &#x3bc;s to the codes &#x201c;0&#x201d; and &#x201c;1&#x201d;, respectively, in the code sequences [0,0], [0,1], [1,0] and [1,1] representing the transmission information &#x201c;0&#x201d; to &#x201c;3&#x201d; represented using the binary system, and sequentially transmits four radio signals having the assigned four frame lengths.

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Soraku-gun, Japan

Hiroyuki Yomo