Wireless sensor network system, information gathering apparatus, sensor device, and connection method for use in wireless sensor network

摘要

A wireless sensor network system includes a plurality of sensor devices each having a non-directional antenna, and an information gathering apparatus having an adaptive array antenna and gathering information detected by the plurality of sensor devices. Each sensor device includes a transmitter to transmit a transmission request for connecting to the information gathering apparatus. The information gathering apparatus includes, a first directivity-changing section that, when the information gathering apparatus receives a transmission request from an unconnected sensor device, performs one of changing the adaptive array antenna to be non-directional, and changing a directivity of the adaptive array antenna, and that receives a signal transmitted from one of the unconnected sensor device and the unconnected sensor device and a connected sensor device, and a second directivity-changing section to change the directivity in accordance with a reception state of the signal.

主权项

1. A wireless sensor network system comprising:
a plurality of sensor devices each having a non-directional antenna; and an information gathering apparatus having an adaptive array antenna and gathering information detected by the plurality of sensor devices, wherein the wireless sensor network system wirelessly connects the plurality of sensor devices to the information gathering apparatus, each sensor device of the plurality of sensor devices includes a transmitter to transmit a transmission request for connecting to the information gathering apparatus, and the information gathering apparatus includes,
a directivity-changing section configured to set the adaptive array antenna to be non-directional and to change a directivity of the adaptive array antenna in accordance with whether the transmission request was transmitted from at least one of an unconnected sensor device and an unconnected sensor device via a connected sensor device, wherein the directivity-changing section is further configured to determine whether the transmission request was transmitted from one of an unconnected sensor device or from an unconnected sensor device via a connected sensor device, and to change the directivity of the adaptive array antenna to be a directional pattern when it is determined that the transmission request was transmitted from a connected sensor, and wherein the directivity-changing section is configured to set the adaptive array antenna to be non-directional when it is determined that the transmission request was transmitted from an unconnected sensor device via a connected sensor device.