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:
Jan. 27, 2009
Filed:
Jul. 29, 2005
Abhishek Abhishek, Woodinville, WA (US);
Amer A. Hassan, Kirkland, WA (US);
Christian Huitema, Clyde Hill, WA (US);
Jiandong Ruan, Sammamish, WA (US);
Poovanpilli G. Madhavan, Bellevue, WA (US);
Abhishek Abhishek, Woodinville, WA (US);
Amer A. Hassan, Kirkland, WA (US);
Christian Huitema, Clyde Hill, WA (US);
Jiandong Ruan, Sammamish, WA (US);
Poovanpilli G. Madhavan, Bellevue, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A mechanism is provided to extend the range of wireless devices beyond the range limit that results from timing restrictions imposed by the IEEE 802.11 standard. The mechanism, which operates at the upper level of the 802.11 MAC, determines whether the wireless devices are far apart or not far apart. When the wireless devices are determined to be far apart, the standard retransmission protocol at the lower level of the 802.11 MAC is disabled and a custom ACK packet is utilized. Delivery of a transmitted packet is confirmed if the custom ACK packet is received within a maximum delay period that takes into account the longer propagation delay between wireless devices that are far apart.