Wireless local area network (WLAN) method and system for presence detection and location finding
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United States of America Patent
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Apr 21, 2009
Grant Date -
Sep 22, 2005
app pub date -
May 9, 2005
filing date -
Oct 18, 2002
priority date (Note) -
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Abstract
A wireless local area network (WLAN) method and system for presence detection provide a low-cost and WLAN-compatible means for detecting the presence of an asset without requiring full location-finding support within a WLAN environment. The presence of a transmitter is detected by examining the signal strength of a presence signal. The presence signal is WLAN-compatible, but does not require association of the transmitter with the WLAN and does not require a response from the WLAN. The presence signal may be transmitted on multiple WLAN channels for presence detection by multiple WLAN APs. The presence signals transmissions may be periodic or may be stimulated by a stimulus from the WLAN or external device that may or may not be coupled to the WLAN. Location finding can also be performed in combination with the signal strength presence detection.
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