System for locating a mobile unit
First Claim
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1. A system for locating a mobile unit including:
- means for transmitting a first signal at a relatively high power, from an access point;
means for transmitting a second signal at a predetermined, relatively low power, from said access point;
means for receiving said first signal, at a mobile device;
means for determining a first signal strength of said first signal at said means for receiving said first signal;
means for determining whether said first signal strength exceeds a relatively low threshold level so as to determine whether service may be provided;
means for receiving said second signal, at said mobile device;
means for determining a second signal strength of said second signal received at said means for receiving said second signal;
means for determining whether said second signal strength exceeds a relatively high threshold level so as to locate the mobile unit within a known distance of said means for transmitting said second signal.
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Abstract
A wireless local area network (LAN) comprises an access point which transmits a beacon signal at 0 dBm. The detection threshold of the mobile unit is −65 dBm and thus the mobile unit is detected when located within 10 meters of the access point.
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Citations
18 Claims
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1. A system for locating a mobile unit including:
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means for transmitting a first signal at a relatively high power, from an access point; means for transmitting a second signal at a predetermined, relatively low power, from said access point; means for receiving said first signal, at a mobile device; means for determining a first signal strength of said first signal at said means for receiving said first signal; means for determining whether said first signal strength exceeds a relatively low threshold level so as to determine whether service may be provided; means for receiving said second signal, at said mobile device; means for determining a second signal strength of said second signal received at said means for receiving said second signal; means for determining whether said second signal strength exceeds a relatively high threshold level so as to locate the mobile unit within a known distance of said means for transmitting said second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
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17. A system for locating a mobile unit including:
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a first transmitter for transmitting a first signal at a relatively high power, from an access point; a second transmitter for transmitting a second signal at a predetermined, relatively low power, from said access point; a first receiver for receiving said first signal, at a mobile unit; a first detector for determining a first signal strength of said first signal at said first receiver; a first controller for determining whether said first signal strength exceeds a relatively low threshold level so as to determine whether service may be provided; a second receiver for receiving said second signal, at said mobile unit; a second detector for determining a second signal strength of said second signal at said second receiver; a second controller for determining whether said second signal strength exceeds a relatively high threshold level so as to locate the mobile unit within a known distance of said means for transmitting said second signal.
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Specification