Patent ID: 7675410

Claim:
A sensor-net system, comprising: a node including a sensor for obtaining a sensing data, a first controller that generates a first transmit data including the sensing data and a node ID information, and a first wireless processor that transmits the first transmit data to a base station; a locator node including a second wireless processor that sniffs a transmit data from the node to the base station when the node exists in a detection area of the locator node, and a second controller that extracts a node ID information from the transmit data and generates a second transmit data including the extracted node ID information and a locator node ID information; a base station including a node communication processor that receives the first transmit data and extracts the first node ID information when the node exists in a communication area of the base station, and receives the second transmit data and extracts the extracted node ID information and the locator node ID information when the second transmit data is transmitted from the locator node, and a node manager that transmits to a server the ID information extracted from at least one of the first transmit data and the second transmit data; and a server including an event-action manager that receives the ID information, a recording part that records in a locator node position table that relates the locator node ID information to a position of the locator node, and a database manager that identifies the position of a node existing in at least one of the detection area and the communication area, using the received ID information and the locator node position table.