The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
Sep. 20, 2004
Javier Del Prado Pavon, Ossining, NY (US);
Amjad Soomro, Hopewell Junction, NY (US);
Sai Shankar Nandagopalan, Tarrytown, NY (US);
Stefan Mangold, Ossining, NY (US);
Zhun Zhong, Croton-On-Hudson, NY (US);
Javier Del Prado Pavon, Ossining, NY (US);
Amjad Soomro, Hopewell Junction, NY (US);
Sai Shankar Nandagopalan, Tarrytown, NY (US);
Stefan Mangold, Ossining, NY (US);
Zhun Zhong, Croton-On-Hudson, NY (US);
Other;
Abstract
A plurality of methods, computer program product, and apparatus that use a lower 32 bit field of a 64-bit 802.11 TSF timer, so as to encode the reference time instant without the ambiguity as to whether there the reference time is referring to a future time or a past time. According to an aspect of the present invention, the fact that the low order 32 bits of the TSF timer wraps over in about 71 minutes is exploited to remove any ambiguity in the reference times contained in the Schedule Element frame. One method employs an algorithm base on distance between two reference points to determine whether the timer has wrapped around a time period, and another method uses a delay interval or a timeout to determine whether or not the TSF timer is wrapped or unwrapped. Another method includes determining whether an absolute value of X−O is less than, or greater than or equal to maximum value M/2.