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:
May. 14, 1996
Filed:
Dec. 13, 1993
Dale R Buchholz, Palatine, IL (US);
Thomas A Freeburg, Arlington Heights, IL (US);
Hungkun J Chang, Hoffman Estates, IL (US);
Michael P Nolan, Lake Zurich, IL (US);
Paul Odlyzko, Arlington Heights, IL (US);
James D McGrath, Wheeling, IL (US);
William K Doss, Rolling Meadows, IL (US);
Farzad Farhangnia, Palatine, IL (US);
Mark Taylor, Buffalo Grove, IL (US);
Jeffrey W Manning, Merrimack, NH (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
In a wireless TDMA network a control module (CM) sends a time stamp relative to the beginning of its frame in a synchronization packet allowing each of a plurality of user modules (UM) to maintain synchronization relative to the CM. The CM uses a plurality of directional antennas and transmits the synchronization packets over each antenna over a predetermined number of frames. The UMs use a receive time stamp to identify the beginning of a received synchronization packet. The difference between the time stamps combined with a delay constant is used by the UMs to adjust time synchronization to the CM frame.