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:
Nov. 23, 2010
Filed:
Mar. 30, 2005
Joachim J. Kahlert, Aachen, DE;
Markus Baumeister, Aachen, DE;
Olaf Wischhusen, Aachen, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Mobile devices () are handed off in overlapping cells () by tracking a velocity (speed and direction) of movement of any number of the mobile devices (). Access points () are each located in an associated operational cell () and each operates at a dedicated frequency. The initial signal strengths are measured in advance at predefined locations within a defined space () to define signal strengths as location map (). A nearby initial access point (typically the nearest) and at least two nearby (typically next nearest) access points are assigned for one of the mobile devices (), and the frequencies of each access point identified. A tracking processor () periodically scans the frequencies of the nearby access points to determine the location velocity of the mobile device and predict when a handoff will be appropriate. E.g., the actual signal strength measurements between the mobile device and the nearby access points are collected and analyzed to determine a proper time for a handoff of one or more of the nearby access points.