Coordinated radio fine time measurement

US11641635B2 · kind B2 · utility

Assignee

• Cisco Technology, Inc. · US

Inventors

• Jerome Henry · Pittsboro, US
• Matthew A. Silverman · Shaker Heights, US
• John Matthew Swartz · Ruelle M. Durand, US
• Vishal Satyendra Desai · San Jose, US
• Robert Edgar Barton · Richmond, CA

Key dates

• Filing date: Aug 13, 2021
• Grant date: May 2, 2023
• Expiry date: Aug 13, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S5/14
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Coordinated radio fine time measurement is provided via sending, from a client device, a ranging request to a first radio; receiving a first response sent at a first time from the first radio over a first channel; receiving a second response sent at the first time from a second radio over a second channel; and calculating, based on times of flight for the first response and the second response, a location of the client device relative to the first radio and to the second radio. Coordinated radio fine time measurement is also proved via in response to receiving, at an Access Point (AP), a ranging request from a client device and determining to respond using multiple channels: sending, both at a first time, a first response from a first radio over a first channel a second response from a second radio over a different channel.