Jeffrey A Manning

US Patent:

55175058, May 14, 1996

Filed:

Dec 13, 1993

Appl. No.:

8/165782

Inventors:

Dale R. Buchholz - Palatine IL
Thomas A. Freeburg - Arlington Heights IL
Hungkun J. Chang - Hoffman Estates IL
Michael P. Nolan - Lake Zurich IL
Paul Odlyzko - Arlington Heights IL
James D. McGrath - Wheeling IL
William K. Doss - Rolling Meadows IL
Farzad Farhangnia - Palatine IL
Mark Taylor - Buffalo Grove IL
Jeffrey W. Manning - Merrimack NH

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 306
H04J 324

US Classification:

3701051

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.