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. 15, 2013
Filed:
Feb. 18, 2009
David Blaine Dietz, Waterloo, CA;
Nagula Tharma Sangary, Waterloo, CA;
Sean Bartholomew Simmons, Waterloo, CA;
Mihal Lazaridis, Waterloo, CA;
Jonathan Cyril Skilton Doll, Waterloo, CA;
Perry Jarmuszewskl, Waterloo, CA;
David Blaine Dietz, Waterloo, CA;
Nagula Tharma Sangary, Waterloo, CA;
Sean Bartholomew Simmons, Waterloo, CA;
Mihal Lazaridis, Waterloo, CA;
Jonathan Cyril Skilton Doll, Waterloo, CA;
Perry Jarmuszewskl, Waterloo, CA;
Research In Motion Limited, Waterloo, CA;
Abstract
A system and method for speed measurement of a mobile device, using an speed sensor such as a satellite navigation system or an accelerometer, does not need such speed sensor to be continually activated. The system and method make use of a monitor for monitoring at least one motion indicium for indicating that the speed of the mobile device is above an initial threshold, including but not limited to: monitoring the Doppler shift measurements of a timing signal; monitoring the timing advance of a cellular radio signal; monitoring the number of base stations visible to the mobile device; monitoring the frequency of base station handover, however determined; monitoring the level crossings and/or the autocorrelation of an RSSI signal; and/or triangulation of the position of the mobile device. When the monitor determines that the mobile device may be travelling in excess of a threshold speed, a speed sensor is activated to confirm the indication. If the speed sensor determines that the mobile device is travelling at a speed below a second threshold, the speed sensor is deactivated.