Locating a WLAN station using signal propagation delay

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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C455S456100, C455S456500, C455S456600, C455S041200, C455S067110, C455S067130, C455S507000, C455S513000, C709S224000, C709S238000, C709S239000, C370S236000, C370S237000, C370S238000, C370S503000, C370S508000, C342S118000, C342S126000, C342S450000, C342S453000, C342S458000

Reexamination Certificate

active

07996020

ABSTRACT:
A wireless network device including: a first RF transceiver module configured to (i) for a predetermined number of times, transmit a data frame to a second RF transceiver module, and (ii) for each data frame transmitted to the second RF transceiver module, receive an acknowledgement frame from the second RF transceiver module after a respective delay period; a timing module configured to generate a timer value corresponding to an accumulated delay period, wherein the accumulated delay period corresponds to each of the respective delay periods; and a control module configured to (i) determine the predetermined number of times that the first RF transceiver transmitted the data frame to the second RF transceiver based on a resolution of the timing module, and, (ii) determine an actual delay period based on (a) the timer value and (b) the predetermined number of times.

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