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:
Feb. 12, 2013
Filed:
Jan. 25, 2008
Amer A. Hassan, Kirkland, WA (US);
Adam Sapek, Redmond, WA (US);
Hui Shen, Sammamish, WA (US);
Thomas W. Kuehnel, Seattle, WA (US);
Deyun Wu, Sammamish, WA (US);
Christian Huitema, Clyde Hill, WA (US);
Amer A. Hassan, Kirkland, WA (US);
Adam Sapek, Redmond, WA (US);
Hui Shen, Sammamish, WA (US);
Thomas W. Kuehnel, Seattle, WA (US);
Deyun Wu, Sammamish, WA (US);
Christian Huitema, Clyde Hill, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A communication system in which an access point and one or more devices communicating through the access point adaptively apply Orthogonal Frequency Division Multiple Access (OFDMA). The access point may assign orthogonal subcarriers to devices as in conventional OFDMA, but the access point senses activity on the subcarriers and selects subcarriers without activity for assignment. In an alternative approach, a device that is configured for OFDMA communication may receive a channel assignment from a device that does not support OFDMA. The OFDMA-capable device may use only a portion of the subcarriers in the assigned channel, which may be communicated to the non-OFDMA device. During the non-OFDMA device may then ignore unused subcarriers in error detection and correction to avoid incorrectly classifying communications as erroneous. Information about OFDMA capabilities, subcarrier assignments and subcarriers in use may be communicated as information elements in network control communications, such as beacons and probe messages.