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Microsoft LOCADIO uses in-building Wi-Fi to determine the location of wireless devices
LOCADIO technology pairs readings of IEEE 802.11x received signal-strength indication (RSSI) with probabilistic analysis of building floor plans to deduce where a given wireless-enabled device is in a building. Such deduction can locate a wireless device to within a room (or within a specific portion of a larger room or hallway) up to an accuracy of about 1.5 meters, opening new opportunities for licensees in security, user interface, asset tracking, and data delivery. LOCADIO is a technology, rather than a new Microsoft product. It provides a software foundation that licensees can extend and refine to meet specific needs. The technology is “hardware-agnostic” in that it is not tethered to any specific brand of system hardware. LOCADIO complements GPS and RFID technologies, in that it operates indoors (unlike GPS, which requires a view of the sky), can be implemented even for a relatively few wireless-enabled devices (unlike RFID, which requires tracking a large number of transponders to justify the infrastructure investment), and works at ranges greater than RFID. In addition to the UI, LOCADIO licensees receive the LOCADIO source code, examples using the source code, specific API documentation, underlying intellectual property rights, and access to the many patents Microsoft has filed related to Wi-Fi location technology. LOCADIO as well as related research are covered by several US and international patents, the list of which can be provided to serious candidates.novelty LOCADIOsolution lies measurements Wi-Fi signal strength wireless device matching readings against paths Monitoring RSSI (received signal-strength indication) access point alone best ambiguous location

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