John Z Deng

US Patent:

7558852, Jul 7, 2009

Filed:

Aug 21, 2007

Appl. No.:

11/842549

Inventors:

Bretton Lee Douglas - San Jose CA, US
Timothy S. Olson - San Jose CA, US
David E. Halasz - Stow OH, US
John Z. Deng - Canton OH, US
Arnold M. Bilstad - Redwood City CA, US
Sheausong Yang - Saratoga CA, US
Richard D. Rebo - North Royalton OH, US
Jonathan S. Leary - Boston MA, US
Daryl A. Kaiser - Los Gatos CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 15/173

US Classification:

709224, 709236, 4554042, 4554561

Abstract:

Determining the location of a radio tag or client station of a wireless network, and the location of coverage holes by receiving from a plurality of wireless stations of the wireless network path loss information of the path loss of one or more location frames received at the respective wireless stations. The location frames transmitted by the radio tag or client station having a pre-defined frame structure. The radio tags and client stations use a common infrastructure for transmitting a location frame configured for radiolocation by path loss measurement. The common infrastructure includes a pre-defined protocol common for both radio tags and client stations for transmitting information for reception by the plurality of stations of the wireless network for radiolocation. The pre-defined protocol includes using the location frame having the pre-defined frame structure.

US Patent:

20060075131, Apr 6, 2006

Filed:

Nov 22, 2005

Appl. No.:

11/286086

Inventors:

Bretton Douglas - San Jose CA, US
Timothy Olson - San Jose CA, US
David Halasz - Stow OH, US
John Deng - Canton OH, US
Arnold Bilstad - Redwood City CA, US
Sheausong Yang - Saratoga CA, US
Richard Rebo - North Royalton OH, US
Jonathan Leary - Boston MA, US
Daryl Kaiser - Los Gatos CA, US

International Classification:

G06F 15/16

US Classification:

709230000

Abstract:

Determining the location of a radio tag or client station of a wireless network, and the location of coverage holes by receiving from a plurality of wireless stations of the wireless network path loss information of the path loss of one or more location frames received at the respective wireless stations. The location frames transmitted by the radio tag or client station having a pre-defined frame structure. The radio tags and client stations use a common infrastructure for transmitting a location frame configured for radiolocation by path loss measurement. The common infrastructure includes a pre-defined protocol common for both radio tags and client stations for transmitting information for reception by the plurality of stations of the wireless network for radiolocation. The pre-defined protocol includes using the location frame having the pre-defined frame structure.