Sony Corporation

Nobuhiko Watanabe

Kazuyuki Sakoda

Masato Tanaka

Chihiro Fujita

Yoshihiko Ikenaga

Takenori Sonoda

Takatoshi Nakamura

Mitsuru Takehara

Masayuki Takada

Natsuki Itaya

Shuhei Sonoda

Katsuya Yamamoto

Tomoya Yamaura

Hiroshi Yasuda

Tetsu Watanabe

Tetsuya Naruse

Jun Iwasaki

Satoshi Yokoya

Chiaki Kanai

Ryuji Oki

Yoshikazu Tsuchiya

Jun Iwaskai

There is provided a wireless communication apparatus and wireless communication method, which can perform information transfer, while suppressing interference to other terminal stations, and preventing a reduction of a transmission opportunity of other terminal stations. By causing the transmission power to be reduced, at the time when a traffic amount to be transmitted and received by itself increases, a terminal station which performs wireless access based on CSMA on a mesh network can suppress interference to other surrounding terminal stations, and can prevent a reduction of a transmission opportunity of other terminal stations. By measuring the number of and sizes of packets to be transmitted and received, it is possible for a terminal station to comprehend the traffic amount to be transmitted and received by itself, and perform a control of the transmission power by this.

Wireless communication apparatus and wireless communication method

Communication resources are appropriately used. An information processing device is an information processing device including an acquisition unit and a control unit. Here, the acquisition unit acquires a relative priority of each information processing device in a network built through autonomous wireless communication of a plurality of information processing devices. In addition, the control unit performs control such that a communication resource of the network is allocated based on the priority (a relative priority of each information processing device in the network) acquired by the acquisition unit.

Information processing device, information processing method and program

Wireless communication apparatus with transmission power control

There is provided a method for generation and management of communication paths between a plurality of information processing devices are properly performed. An information processing device is equipped with a communication unit and a control unit to perform the method. The communication unit exchanges a signal for generation or updating of a multi-hop communication path using wireless communication with another information processing device. In addition, the control unit performs control for delaying a timing at which path information regarding a communication path set through the exchange of the signal for generation and updating of the multi-hop communication path is confirmed with reference to a reception timing of the signal.

Information processing device and information processing method

Generation and management of a communication path between a plurality of information processing devices are properly performed. An information processing device is equipped with a communication unit and a control unit. The communication unit performs exchange of a signal for generating or updating of a multi-hop communication path using wireless communication with another information processing device. In addition, the control unit performs control for updating path information regarding the communication path set through the exchange of the signal for generating or updating of the multi-hop communication path before the path information is destroyed.

An information processing device equipped with a communication unit and a control unit. The communication unit exchanges a signal for generation or updating of a multi-hop communication path using wireless communication with another information processing device. In addition, the control unit performs control such that, when there is path information regarding a communication path to another information processing device in a case in which the signal for generation or updating of a multi-hop communication path is transmitted to the other information processing device, the signal is transmitted to the other information processing device in unicast, and the signal is transmitted in broadcast.

Generation and management of communication paths between information processing devices

Generation and management of a communication path between a plurality of information processing devices are properly performed. An information processing device is an information processing device equipped with a communication unit and a control unit. The communication unit performs exchange of a signal for generation or updating of a multi-hop communication path using wireless communication with another information processing device. In addition, the control unit performs control to change a metric value included in the signal for generation or updating of the multi-hop communication path based on a state of the information processing device.

To suitably perform information transfer, while suppressing interference to other terminal stations, and preventing a reduction of a transmission opportunity of other terminal stations. A terminal station estimates a distance of another terminal station (within a receivable range), from an MCS or RSSI, for example, and controls a transmission power of itself, in accordance with a value weighted with respect to distance. For example, in the case where it is estimated that a number of terminal stations with a far distance has increased, from the value weighted with respect to distance, a transmission power of itself is lowered. As a result of this, transmission by multi-hop is explicitly performed, and it is possible to suppress electric wave interference of a multi-hop destination.

Disconnection from a network is easily recognized. A plurality of information processing devices connected over a network is disclosed. The network is built through wireless communication of the plurality of information processing devices. The plurality of information processing devices includes at least a first information processing device and a second information processing device. A detection unit of the first information processing device is configured to detect the second information processing device that is disconnected from the network. A control unit of the first information processing device is configured to output first information about the detected second information processing device as disconnection information.

A pilot signal detection method and a receiver, in which a search window having a predetermined time width is generated at every substantially constant time interval, and pilot signals existing in search window thus generated are detected. The position of the search window of each period is set in accordance with the delay amount between the timing (T_ref) of the first pilot signal and the timing (T_last) of the last pilot signal detected in the immediately preceding search window.

Pilot signal detection method and receiver

In a receiving method and receiver for spread spectrum signals, a predetermined detection phase range is set as a reference phase position with a receiving timing of a spectrum signal having the highest correlation value with a diffusion code among a plurality of spread spectrum signals received, spread spectrum signals of which the correlation values with the diffusion codes are a predetermined level or more are detected from the spread spectrum signals within the predetermined detection phase range, a demodulation signal is generated from the spread spectrum signals, of which the correlation values are at least at the predetermined level. Then, the steps of setting the predetermined detection phase range, detecting the spread spectrum signals, and generating the modulation signal are repeated. If the spread spectrum signal, of which the correlation values with the diffusion codes are at least at the predetermined, level, can not be detected within the predetermined detection phase range, the detection phase range is widened based on the reference phase position.

Receiving method and receiver for spread spectrum signal

When demodulated signals through respective paths are combined by a data combiner, with write addresses of count values of PN phase counters that represent the phases of the PN codes of fingers, the demodulated signals that are output from the fingers are stored in memories. With a common read and combined to form a single demodulated signal address, signals stored in the memories are read.

Demodulating method and apparatus, receiving method and apparatus and

In a control voltage producing apparatus, either a pulse-duration modulation signal or a pulse-width modulation signal, which are generated in response to a digital control signal, is from a first buffer circuit to an averaging circuit so as to be averaged. A power supply voltage is supplied from a first voltage source to this first buffer circuit. Then, the averaged signal is supplied to a control voltage producing circuit for producing a target control voltage. When a control voltage is produced, the same output voltage as that of the first buffer circuit is generated by a second buffer circuit, and then is supplied to the control voltage generating circuit and an operation control circuit. In response to the output voltage derived from the second buffer circuit, the operation control circuit applies the power supply voltage to the control voltage producing circuit so as to cause this control voltage producing circuit to be operable. Also, the control voltage producing circuit uses the output voltage derived from the second buffer circuit as the reference voltage so as to regulate the control voltage. As a consequence, in response to one of the output voltages derived from the second buffer circuit, turning ON/OFF of the control voltage producing circuit can be controlled, and further the reference voltage used to regulate the control voltage can be applied.

Growing community of inventors

Kanagawa, Japan

Nobuhiko Watanabe