Tag location, client location, and coverage hole location in a wireless network

US7558852B2 · kind B2 · utility

Assignee

• Cisco Technology, Inc. · US

Inventors

• Bretton Douglas · Sunnyvale, US
• Timothy S. Olson · San Jose, US
• David E. Halasz · Stow, US
• John Z. Deng · Canton, US
• Arnold Mark Bilstad · Los Altos, US
• Sheausong Yang · Saratoga, US
• Richard D. Rebo · North Royalton, US
• Jonathan Leary · Brookline, US
• Daryl A. Kaiser · Los Gatos, US

Key dates

• Filing date: Aug 21, 2007
• Grant date: Jul 7, 2009
• Expiry date: Aug 21, 2027

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W80/00
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

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.