Nec Communication Systems, Ltd.

Advanced Telecommunications Research Institute International

A School Corporation Kansai University

Masahito Iwai

Hiroyuki Yomo

Takatoshi Kimura

Tetsuya Ito

Yukihiro Hara

Akio Hasegawa

Suhua Tang

Yoshihisa Kondo

Kenichi Abe

Hiroyuki Iizuka

Koichi Yoshimura

Toshiyasu Tanaka

Takahiro Hasegawa

Sadao Obana

Yuichiro Ezure

Chikashi Ito

Yuma Asada

Yuta Okamoto

Shota Kakibuti

Ryou Nagase

Shohei Fukayama

Hironori Fukui

Noboru Miyamoto

Provided is an article position management apparatus that a receiver receives image data from a camera apparatus and that identifies a position of an article, based on an article marker attached to an article and a reference point marker whose coordinate information in an absolute coordinate system in a field is set in advance, the article marker and the reference point marker being included in the image data, when the camera apparatus is a mobile camera apparatus, and identifies the position of the article, based on the article marker included in the image, when the camera apparatus is a fixed camera apparatus.

Article position managing apparatus, article position management system, article position managing method, and program

Article position estimation system comprises: article movement recognition part; reference point recognition part; position information generation part; and article position estimation part. Article movement recognition part generates article movement information including time point when article is taken out by mobile body or time point when article placement is completed by mobile body. Reference point recognition part recognizes reference point and generates reference point recognition information including identification information according to recognized reference point, reference point recognition time point, and information related to recognized reference point. Position information generation part generates information related to position of mobile body at reference point recognition time point based on reference point recognition information. Article position estimation part estimates position of mobile body at the time when article is moved by using at least position of mobile body at reference point recognition time point.

Article position estimation system and article position estimation method

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

When a terminal device initiates a wireless communication when it has not established a wireless link between itself and another wireless device, it transmits, as a management frames in active scanning, a plurality of activation probe requests having frame lengths representing an identifier of a wireless base station to which connection is being made and which is intended to transition from sleep mode to operating mode. Then, the wireless base station receives the plurality of activation probe requests transmitted by the terminal device as management frames in active scanning in a wireless LAN, and, when a plurality of dummy network identifiers detected based on the received plurality of activation probe requests represent the identifier of its own, transitions from sleep mode to operating mode.

Terminal device, wireless device wirelessly communicating with the same, and wireless communication system including the terminal device and wireless device

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 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

A packet interval (a time difference between sequentially received packets) in a certain previous time is calculated and a cumulative distribution function of the calculated packet interval is obtained. Meanwhile, a function value-corresponding to-flow end that is a boundary value of the cumulative distribution function to be considered as a flow end (timeout) in the range of a cumulative distribution function value is stored. From the cumulative distribution function obtained as described above, a value of a packet interval mapped to a cumulative distribution function value that matches the function value-corresponding to-flow end is set as a threshold. That is, the threshold is dynamically set based on a previous packet interval. Therefore, a packet stop period from a last packet reception time to a current time is measured, and it is detected as a flow timeout at a timing when the measured value is equal to or greater than the threshold.

Communication apparatus, communication state detecting method, and communication state detecting program

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.

Growing community of inventors

Minato-ku, Japan

Masahito Iwai